Not pure physically; mixed or impregnated with extraneous, and especially with offensive, matter; foul; feculent; tainted: as, impure water or air; impure salt or magnesia.Not simple or unmixed; mixed or combined with something else: said of immaterial things.Not pure morally; unchaste; obscene; lewd: as, impure language or ideas; impure actions.Of a contaminating nature; causing defilement, physical or moral; unclean; abominable.Not in conformity with a standard of correctness, simplicity, etc.: as, an impure style of writing.To make impure; defile.To grow impure.