English Antonyms for Shape and Form Vocabulary Words – Online Quiz!

amorphous (adjective) /əˈmɔːfəs/
Definition: Lacking a definite or well-defined shape, structure, or form.
Antonyms quiz: Choose the opposite meaning of amorphous.
Options: characterless; inchoate; indeterminate; structured
Answer: structured
Example sentence: "His dreams were amorphous, shifting every night."

asymmetrical (adjective) /ˌeɪsɪˈmɛtrɪkl/
Definition: Having a lack of symmetry or balance between the two sides or parts of an object, organism, or structure.
Antonyms quiz: Choose the opposite meaning of asymmetrical.
Options: askew; crooked; irregular; symmetrical
Answer: symmetrical
Example sentence: "The tree had an asymmetrical shape due to wind exposure."

bisect (verb) /bʌɪˈsɛkt/
Definition: To divide or cut something into two equal or congruent parts, typically along a straight line or plane.
Antonyms quiz: Choose the opposite meaning of bisect.
Options: bifurcate; cleave; cross; unite
Answer: unite
Example sentence: "A thick wall of fog began to bisect the valley as the sun started to set."

bulbous (adjective) /ˈbʌlbəs/
Definition: Having a round, swollen, or bulb-shaped appearance, often resembling a bulb.
Antonyms quiz: Choose the opposite meaning of bulbous.
Options: balled; bloated; bowed; flat
Answer: flat
Example sentence: "The balloon had a bulbous shape that made it easy to grip."

circumference (noun) /sərˈkʌm fər əns/
Definition: The distance around the outer boundary of a circular or curved object.
Antonyms quiz: Choose the opposite meaning of circumference.
Options: boundary; brink; circuit; center
Answer: center
Example sentence: "The hula hoop's circumference determined whether it would fit around her waist."

concave (adjective) /ˈkɒnkeɪv/
Definition: Having a surface or shape that curves inward, creating a hollow or depressed appearance.
Antonyms quiz: Choose the opposite meaning of concave.
Options: caved; cupped; depressed; convex
Answer: convex
Example sentence: "The path in the park followed a concave curve, providing a sheltered spot for the bench."

concentric (adjective) /kənˈsɛntrɪk/
Definition: Having a geometric configuration in which one or more circles, spheres, or shapes share the same center point.
Antonyms quiz: Choose the opposite meaning of concentric.
Options: aligned; centered; central; disparate
Answer: disparate
Example sentence: "The ancient fortress had concentric walls for added defense."

concertina (verb) /ˌkɒnsəˈtiːnə/
Definition: To fold or collapse something into a compact and organized form, much like the musical instrument of the same name.
Antonyms quiz: Choose the opposite meaning of concertina.
Options: accordioned; collapsed; compressed; expand
Answer: expand
Example sentence: "In her hands, soft fabrics concertina into elegant, wearable art forms, magically."

contour (noun) /ˈkɒn tʊər/
Definition: The outline or shape of an object, surface, or area.
Antonyms quiz: Choose the opposite meaning of contour.
Options: boundary; configuration; curve; center
Answer: center
Example sentence: "The makeup artist used contour to enhance the model's cheekbones and create dimension."

convex (adjective) /ˈkɒnvɛks/
Definition: Having a surface or shape that curves outward, like the exterior of a sphere or a balloon.
Antonyms quiz: Choose the opposite meaning of convex.
Options: arched; bowed; bulging; concave
Answer: concave
Example sentence: "The lenses in her glasses were slightly convex to correct her vision."

corrugated (adjective) /ˈkɒrəɡeɪtɪd/
Definition: Shaped into a series of alternating ridges and grooves or parallel folds.
Antonyms quiz: Choose the opposite meaning of corrugated.
Options: creased; crimped; crinkled; smooth
Answer: smooth
Example sentence: "The corrugated plastic panels provided insulation for the greenhouse."

crack (noun) /kræk/
Definition: A narrow opening, fissure, or break in a solid object, such as a surface, structure, or substance.
Antonyms quiz: Choose the opposite meaning of crack.
Options: break; burst; chink; closure
Answer: closure
Example sentence: "The hiker carefully crossed the narrow crack in the rocky cliff."

crescent (noun) /ˈkrɛznt/
Definition: A curved or rounded shape that resembles the shape of the moon in its first or last quarter.
Antonyms quiz: Choose the opposite meaning of crescent.
Options: arc; arch; bend; straight
Answer: straight
Example sentence: "The crescent of the coastline formed a natural harbor."

crest (noun) /krɛst/
Definition: The highest point or peak of something, typically referring to the topmost part of a physical object or a natural formation.
Antonyms quiz: Choose the opposite meaning of crest.
Options: peak; summit; top; base
Answer: base
Example sentence: "The company unveiled a new logo with a stylized crest as a symbol of its heritage."

crevice (noun) /ˈkrɛvɪs/
Definition: A narrow and often deep crack or opening in a surface, typically in rock, soil, or a wall.
Antonyms quiz: Choose the opposite meaning of crevice.
Options: chasm; chink; cleft; closure
Answer: closure
Example sentence: "Light filtered through the crevice, revealing hidden treasures."

crooked (adjective) /ˈkrʊk ɪd/
Definition: Physically bent, curved, or not straight.
Antonyms quiz: Choose the opposite meaning of crooked.
Options: askew; bent; contorted; straight
Answer: straight
Example sentence: "The crooked contractor overcharged clients for subpar construction work."

dilate (verb) /dʌɪˈleɪt/
Definition: To expand, widen, or enlarge something, typically by increasing its physical dimensions or the space it occupies.
Antonyms quiz: Choose the opposite meaning of dilate.
Options: broaden; distend; enlarge; contract
Answer: contract
Example sentence: "Emotional stress can cause blood vessels to dilate, leading to a flushed appearance."

divot (noun) /ˈdɪvət/
Definition: A small piece of turf or earth that is displaced or removed from a surface, typically by a tool or foot.
Antonyms quiz: Choose the opposite meaning of divot.
Options: cavity; cleft; clod; flatness
Answer: flatness
Example sentence: "The groundskeeper filled in the divots on the tennis court to ensure a smooth surface."

ellipse (noun) /ɪˈlɪps/
Definition: A geometric shape formed by a curved and closed path in a plane.
Antonyms quiz: Choose the opposite meaning of ellipse.
Options: circlet; curve; egg; line
Answer: line
Example sentence: "In orbital mechanics, planets move in paths closely approximating elliptical shapes."

elongate (verb) /ˈiːlɒŋɡeɪt/
Definition: To lengthen or extend something, typically a physical object or structure, making it longer in relation to its original size or shape.
Antonyms quiz: Choose the opposite meaning of elongate.
Options: expand; extend; increase; shorten
Answer: shorten
Example sentence: "The snake can elongate its jaw to swallow prey whole."

granular (adjective) /ˈɡranjʊlə/
Definition: Having a texture or composition characterized by the presence of small, discrete particles or grains.
Antonyms quiz: Choose the opposite meaning of granular.
Options: coarse; crumbly; grainy; smooth
Answer: smooth
Example sentence: "Her voice had a granular quality, like gravel underfoot."

helix (noun) /ˈhiːlɪks/
Definition: A type of three-dimensional geometric shape that resembles a spiral or a spring.
Antonyms quiz: Choose the opposite meaning of helix.
Options: coil; corkscrew; curl; straight
Answer: straight
Example sentence: "The amusement park's new roller coaster features a thrilling helix turn."

imprint (noun) /ˈɪm prɪnt/
Definition: A mark, pattern, or design that is permanently pressed, engraved, or stamped onto a surface.
Antonyms quiz: Choose the opposite meaning of imprint.
Options: badge; brand; design; erase
Answer: erase
Example sentence: "The shoe left a muddy imprint on the clean floor."

level (noun) /ˈlɛv əl/
Definition: A flat or even surface that does not slope or tilt.
Antonyms quiz: Choose the opposite meaning of level.
Options: degree; extent; flat; uneven
Answer: uneven
Example sentence: "The game difficulty increases with each level."

morph (verb) /mɔːf/
Definition: To transform or change gradually from one form or state into another.
Antonyms quiz: Choose the opposite meaning of morph.
Options: alter; contort; distort; remain
Answer: remain
Example sentence: "The science fiction novel imagined a future where humans could morph their bodies."

obverse (noun) /ˈɒb vɜrs/
Definition: The front or primary side of a coin, medal, or other similar objects.
Antonyms quiz: Choose the opposite meaning of obverse.
Options: appearance; aspect; countenance; reverse
Answer: reverse
Example sentence: "The obverse of this argument is equally compelling."

orbicular (adjective) /ɔːˈbɪkjʊlə/
Definition: Spherical or circular in shape.
Antonyms quiz: Choose the opposite meaning of orbicular.
Options: annular; circular; cyclical; square
Answer: square
Example sentence: "The gymnast executed a flawless routine, spinning in a perfect orbicular motion."

polygon (noun) /ˈpɒlɪɡ(ə)n/
Definition: A two-dimensional geometric shape that is bound by straight sides.
Antonyms quiz: Choose the opposite meaning of polygon.
Options: heptagon; hexagon; nonagon; curve
Answer: curve
Example sentence: "The city map was divided into several polygons representing different districts."

polyhedron (noun) /ˌpɒlɪˈhiːdr(ə)n/
Definition: A three-dimensional geometric shape that has flat faces and straight edges.
Antonyms quiz: Choose the opposite meaning of polyhedron.
Options: platonic; cube; cuboid; sphere
Answer: sphere
Example sentence: "The architecture of the building incorporated polyhedron shapes for a modern look."

protrude (verb) /proʊˈtrud/
Definition: To extend or stick out from a surface or area beyond what is normal or expected.
Antonyms quiz: Choose the opposite meaning of protrude.
Options: bulge; emerge; extrude; recess
Answer: recess
Example sentence: "The sculpture's intricate details cause parts to protrude outward."

protrusion (noun) /proʊˈtru ʒən/
Definition: An outward or projecting part, object, or formation that extends beyond its surrounding surface or environment.
Antonyms quiz: Choose the opposite meaning of protrusion.
Options: bulge; bump; extension; indentation
Answer: indentation
Example sentence: "The doctor noted a small protrusion in the patient's abdomen and ordered further tests."

protuberance (noun) /proʊˈtu bər əns/
Definition: A noticeable or prominent bulge, projection, or swelling that extends outward from a surface.
Antonyms quiz: Choose the opposite meaning of protuberance.
Options: bulge; bump; excrescence; dent
Answer: dent
Example sentence: "The geologist studied the protuberances on the rock formation, deciphering their geological significance."

quadrant (noun) /ˈkwɒdr(ə)nt/
Definition: A geometric shape that is formed by dividing a circle into four equal parts.
Antonyms quiz: Choose the opposite meaning of quadrant.
Options: arc; fourth; fragment; whole
Answer: whole
Example sentence: "She marked her location on the map's northwest quadrant."

radius (noun) /ˈreɪ di əs/
Definition: The distance from the center of a circle or sphere to any point on its circumference or surface.
Antonyms quiz: Choose the opposite meaning of radius.
Options: distance; expanse; extent; entirety
Answer: entirety
Example sentence: "The cyclist carefully adjusted the radius of the bike's wheels for optimal performance."

serpentine (adjective) /ˈsəːp(ə)ntʌɪn/
Definition: Resembling or having characteristics similar to a snake or serpent.
Antonyms quiz: Choose the opposite meaning of serpentine.
Options: bending; coiling; crooked; straight
Answer: straight
Example sentence: "The mountain road twisted in serpentine curves, challenging drivers."

sinuous (adjective) /ˈsɪnwəs/
Definition: Possessing a gracefully curving and winding form or movement.
Antonyms quiz: Choose the opposite meaning of sinuous.
Options: bending; meandering; serpentine; straight
Answer: straight
Example sentence: "The road followed a sinuous path up the mountain."

slanted (adjective) /ˈslɑːntɪd/
Definition: Inclined or tilted to one side.
Antonyms quiz: Choose the opposite meaning of slanted.
Options: angled; askew; canted; unbiased
Answer: unbiased
Example sentence: "The journalist accused the newspaper of publishing a slanted article that favored a specific political party."

slit (noun) /slɪt/
Definition: A narrow, elongated opening or cut in a surface or material.
Antonyms quiz: Choose the opposite meaning of slit.
Options: aperture; break; chink; closure
Answer: closure
Example sentence: "The knife left a deep slit in the surface of the table."

spike (noun) /spaɪk/
Definition: A slender, pointed object or projection that protrudes from a surface or material.
Antonyms quiz: Choose the opposite meaning of spike.
Options: acicula; apex; barb; blunt
Answer: blunt
Example sentence: "The hiker had to carefully navigate through the dense thicket of spikes on the cactus."

supine (adjective) /ˈs(j)uːpʌɪn/
Definition: Lying flat on one's back with one's face and stomach facing upwards.
Antonyms quiz: Choose the opposite meaning of supine.
Options: horizontal; inactive; inert; upright
Answer: upright
Example sentence: "The yoga instructor instructed the students to lie supine on their mats for a relaxing stretch."

tortuous (adjective) /ˈtɔːtʃʊəs/
Definition: Characterized by twists, turns, and complex, winding paths or processes.
Antonyms quiz: Choose the opposite meaning of tortuous.
Options: bent; convoluted; crooked; direct
Answer: direct
Example sentence: "The river's tortuous course carved a deep canyon."

turgid (adjective) /ˈtəːdʒɪd/
Definition: Excessively inflated, swollen, or distended beyond its normal or natural state.
Antonyms quiz: Choose the opposite meaning of turgid.
Options: bulging; congested; inflated; deflated
Answer: deflated
Example sentence: "His lecture was full of turgid language, confusing many in the audience."

twist (verb) /twɪst/
Definition: To rotate or turn something forcefully or in a way that causes it to change its original shape, position, or direction.
Antonyms quiz: Choose the opposite meaning of twist.
Options: coil; contort; curve; straighten
Answer: straighten
Example sentence: "Carefully, she began to twist the lid off the jar of pickles."

warp (verb) /wɔrp/
Definition: To twist, distort, or bent out of shape.
Antonyms quiz: Choose the opposite meaning of warp.
Options: bend; bow; buckle; straighten
Answer: straighten
Example sentence: "The painting on the wall began to warp as a result of prolonged sunlight exposure."