abnormal (adjective) /æbˈnɔr məl/
Definition: Deviating from what is considered normal, typical, or expected.
Example Sentence: "The test results revealed abnormal levels of cholesterol in his blood."
Synonyms: aberrant; anomalous; atypical; deviant; extraordinary; irregular
Opposite Meaning: normal

amoral (adjective) /eɪˈmɒr(ə)l/
Definition: Having or showing no moral standards, principals, or sense of right or wrong.
Example Sentence: "The amoral thief had no guilt about stealing from others."
Synonyms: conscienceless; corrupt; debauched; degenerate; depraved; dissolute
Opposite Meaning: ethical

complicit (adjective) /kəmˈplɪsɪt/
Definition: Involved in or associated with an illegal, unethical, or immoral action or situation.
Example Sentence: "The media was complicit in spreading false information."
Synonyms: accessory; aiding; associated; collaborating; colluding; connected
Opposite Meaning: innocent

condone (verb) /kənˈdəʊn/
Definition: To overlook excuse or tolerate an action or behavior that is considered to be wrong or unacceptable.
Example Sentence: "The teacher could not condone cheating and gave the student a failing grade."
Synonyms: accept; allow; disregard; excuse; forgive; ignore
Opposite Meaning: condemn

corrupt (adjective) /kəˈrʌpt/
Definition: Morally compromised, dishonest, or involved in unethical practices.
Example Sentence: "The corrupt politician was involved in multiple bribery scandals."
Synonyms: bribeable; crooked; depraved; dishonest; fraudulent; immoral
Opposite Meaning: honest

devious (adjective) /ˈdiːviəs/
Definition: Characterized by deceit, cunning, and a deliberate intent to conceal one's true motives or to achieve a goal through indirect, often underhanded means.
Example Sentence: "The devious salesman tried to trick me into buying a faulty product."
Synonyms: artful; conniving; crafty; cunning; deceitful; duplicitous
Opposite Meaning: straightforward

disgraceful (adjective) /dɪsˈgreɪs fəl/
Definition: Deeply shameful, dishonorable, or morally offensive.
Example Sentence: "The judge's biased and unjust ruling was seen as disgraceful by many observers in the courtroom."
Synonyms: abhorrent; deplorable; despicable; dishonorable; ignominious; inexcusable
Opposite Meaning: honorable

disreputable (adjective) /dɪsˈrɛpjʊtəbl/
Definition: Considered to be lacking in respectability, honor, or moral integrity.
Example Sentence: "The disreputable company was known for its shady business practices."
Synonyms: contemptible; discreditable; disgraceful; dishonorable; dubious; ignoble
Opposite Meaning: reputable

foul (adjective) /faʊl/
Definition: Morally offensive, unethical, or contrary to accepted standards of behavior or conduct.
Example Sentence: "The referee blew the whistle to signal a foul committed by the defender."
Synonyms: contaminated; corrupt; illicit; immoral; indecent; nasty
Opposite Meaning: pure

ignoble (adjective) /ɪɡˈnəʊbl/
Definition: Characterized by a lack of honor, moral principles, or ethical integrity.
Example Sentence: "The coach's ignoble tactics of cheating to win games tarnished the team's reputation."
Synonyms: abject; contemptible; corrupt; craven; degenerate; disgraceful
Opposite Meaning: noble

incite (verb) /ɪnˈsʌɪt/
Definition: To encourage or instigate someone to do something, especially something that is harmful or illegal.
Example Sentence: "His reckless words could easily incite panic in the crowd."
Synonyms: foment; goad; inflame; motivate; promote; prompt
Opposite Meaning: discourage

iniquitous (adjective) /ɪˈnɪkwɪtəs/
Definition: Characterized by extreme immorality, wickedness, or gross injustice.
Example Sentence: "The iniquitous nature of his crimes shocked even the most seasoned detectives."
Synonyms: abominable; atrocious; base; heinous; immoral; nefarious
Opposite Meaning: righteous

louche (adjective) /luːʃ/
Definition: Morally dubious, disreputable, or characterized by a lack of respectability.
Example Sentence: "The louche nightclub was known for its drugs and illegal activities."
Synonyms: decadent; discreditable; disgraceful; dishonorable; disreputable; dubious
Opposite Meaning: honorable

peccadillo (noun) /ˌpɛkəˈdɪləʊ/
Definition: A minor or trivial offense, mistake, or fault, often of a moral or ethical nature.
Example Sentence: "His habit of interrupting others was his most annoying peccadillo."
Synonyms: foible; impropriety; indiscretion; infraction; misconduct; misdeed
Opposite Meaning: virtue

perverted (adjective) /pərˈvɜr tɪd/
Definition: Deviating from what is considered morally or socially acceptable.
Example Sentence: "He had a perverted fascination with violence and gore."
Synonyms: aberrant; abnormal; corrupted; debased; decadent; depraved
Opposite Meaning: wholesome

premeditated (adjective) /priˈmɛdəˌteɪtɪd/
Definition: Planned, considered or thought out in advance, typically with the intention of committing a deliberate action or crime.
Example Sentence: "The premeditated murder was planned for weeks before it was carried out."
Synonyms: calculated; conscious; deliberate; designed; intentional; purposeful
Opposite Meaning: spontaneous

psychopath (noun) /ˈsʌɪkəpaθ/
Definition: Someone who lacks empathy and remorse, and who displays impulsive and antisocial behavior.
Example Sentence: "The detective had to enter the mind of a psychopath to catch the serial killer."
Synonyms: amoral; deviant; disturbed; malignant; predatory; remorseless
Opposite Meaning: empath

scoundrel (noun) /ˈskaʊndrəl/
Definition: A person who behaves in a dishonest or immoral way, often engaging in deceitful or unscrupulous actions for their own personal gain.
Example Sentence: "The scoundrel was caught red-handed and brought to justice."
Synonyms: charlatan; cheat; fraud; knave; miscreant; rascal
Opposite Meaning: hero

ulterior (adjective) ulterior/ʌlˈtɪərɪə/
Definition: Hidden or kept secret, particularly with the intention of deceiving or manipulating others.
Example Sentence: "The ulterior motive behind the gift was to gain favor with the boss."
Synonyms: concealed; covert; hidden; private; secondary; secret
Opposite Meaning: overt

unconscionable (adjective) /ʌnˈkɒnʃnəbᵊl/
Definition: Morally or ethically unacceptable or unjustifiable.
Example Sentence: "The landlord's unconscionable rent increase left many tenants homeless."
Synonyms: heinous; immoral; indefensible; inhumane; intolerable; outrageous
Opposite Meaning: ethical

unvirtuous (adjective) /ˌʌnˈvɜːʧuəs/
Definition: Characterized by a lack of virtue, moral excellence, or ethical goodness.
Example Sentence: "The con artist's unvirtuous schemes led to his eventual arrest."
Synonyms: corrupt; depraved; dishonest; dishonorable; immoral; unethical
Opposite Meaning: virtuous

venal (adjective) /ˈviːnl/
Definition: Willing to do something dishonest or corrupt in exchange for money or personal gain.
Example Sentence: "Her venal nature made it hard for her to maintain friendships."
Synonyms: bribable; buyable; corruptible; crooked; dishonest; grafting
Opposite Meaning: honorable