01 a. Not pure; not clean; dirty; foul; filthy; containing something which is unclean or unwholesome; mixed or impregnated extraneous substances;…
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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.
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2.
Defiled by sin or guilt; unholy; unhallowed; -- said of persons or things.
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3.
Unchaste; lewd; unclean; obscene; as, impure language or ideas.
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4.
Not purified according to the ceremonial law of Moses; unclean.(Script.)
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5.
Not accurate; not idiomatic; as, impure Latin; an impure style.(Language)