abate, atrophy, attenuate, attrition, condense, dearth, debase, decrease, decrepit, deflate, denude, deplete, deteriorate, devaluate, devitalize, dilute, diminish, diminution, dissipate, downsize, dwindle, ebb, emasculate, enervate, erase, exacerbate, excision, extenuation, fade, frustrate, impair, impoverish, lessen, meagre, mitigate, nugatory, redundant, regress, sap, shrink, truncate, unabating, vitiate, wane, weaken, whittle