Impure

1. v. t. To defile; to pollute.
2. a. 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.
3. a. Defiled by sin or guilt; unholy; unhallowed; — said of persons or things.
4. a. Unchaste; lewd; unclean; obscene; as, impure language or ideas.
5. a. Not purified according to the ceremonial law of Moses; unclean.
6. a. Not accurate; not idiomatic; as, impure Latin; an impure style.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.