iniquity 3 antonyms and opposites of iniquity. Noun — Deep moral wrongdoing; wickedness or gross injustice. Synonyms for iniquity baseness corruption defilement degeneracy degradation depravedness depravation depravity impurity lewdity malignity misdoing misguilt obliquity peccability perversion pollution pravity sin sinfulness turpitude vitiation wickedness wrongdoing Antonyms for iniquity integrity morality well-doing ← Back to the full definition of iniquity