- Adjective. Not pure; not clean; dirty; foul; filthy; containing something which is unclean or unwholesome; mixed or impregnated extraneous substances; adulterated; as, impure water or air; impure drugs, food, etc.
- Adjective. Defiled by sin or guilt; unholy; unhallowed; -- said of persons or things.
- Adjective. Unchaste; lewd; unclean; obscene; as, impure language or ideas.
- Verb. (transitive) (obsolete) to defile; to pollute.