Im*pure" (?), a. [L. impurus; pref. im- not + purus pure: cf. F. impur. See Pure.]

1. 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.

2. Defiled by sin or guilt; unholy; unhallowed; -- said of persons or things.

3. Unchaste; lewd; unclean; obscene; as, impure language or ideas. "Impure desires." Cowper.

4. (Script.) Not purified according to the ceremonial law of Moses; unclean.

5. (Language) Not accurate; not idiomatic; as, impure Latin; an impure style.

Im*pure", v. t. To defile; to pollute. [Obs.] Bp. Hall.

• Something that flawed or imperfect.