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impure (adj.)

mid-15c., of wine, "muddy, not clear," from Old French impur (13c.), from Latin impurus "not pure, unclean, filthy, foul," from assimilated form of in- "not, opposite of" (see in- (1)) + purus "pure" (see pure).

In English, the subsequent order of sense appearance seems to be "earthly, mundane, not spiritual" (c. 1500); "obscene, lewd, unchaste, immoral" (1530s); "mixed with offensive matter, tainted" (1590s); "mixed or combined with other things" (without reference to foulness), 1620s. As a noun from 1784. Related: Impurely.

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Definitions of impure from WordNet

impure (adj.)
combined with extraneous elements;
impure (adj.)
(used of persons or behaviors) immoral or obscene;
impure thoughts
impure (adj.)
having a physical or moral blemish so as to make impure according to dietary or ceremonial laws; "and the swine...is unclean to you"-Leviticus 11:3;
Synonyms: unclean
From wordnet.princeton.edu