adj. 25B6; adjective
impure gold : ADULTERATED, mixed, combined, blended, alloyed; technical admixed.
the water was impure : CONTAMINATED, polluted, tainted, unwholesome, poisoned; dirty, filthy, foul; unhygienic, unsanitary, insanitary; poetic/literary befouled.
impure thoughts : IMMORAL, sinful, wrongful, wicked; unchaste, lustful, lecherous, lewd, lascivious, prurient, obscene, indecent, ribald, risqué, improper, crude, coarse; formal concupiscent.
clean, chaste.