n. Lack of equity; gross injustice; unrighteousness; wickedness: as, the iniquity of the slave-trade.n. A violation of right or duty; an unjust or wicked action; a wilful wrong or crime.n. In Scots law, inequity; a judicial act or decision contrary to law or equity.n. [capitalized] A comic character or buffoon in the medieval English moralities or moral plays, often otherwise called the Vice, and sometimes by the name of the particular vice he represented.n. Synonyms and Sin, Transgression, etc. See crime.