Im`pro*pri"e*ty\, n.; pl. Improprieties. [L. improprietas; cf. F. impropri['e]t['e]. See Improper.]1. The quality of being improper; unfitness or unsuitableness to character, time place, or circumstances; as, impropriety of behavior or manners. 2. That which is improper; an unsuitable or improper act, or an inaccurate use of language. But every language has likewise its improprieties and absurdities. --Johnson. Many gross improprieties, however authorized by practice, ought to be discarded. --Swift.