Etymology
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unclean (adj.)

Old English unclæne, "morally impure, defiled, unfit for food," from un- (1) "not" + clean (adj.). Literal sense of "dirty" is recorded from mid-13c.

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Definitions of unclean

unclean (adj.)
soiled or likely to soil with dirt or grime;
wore an unclean shirt
Synonyms: dirty / soiled
unclean (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;
unclean meat
Synonyms: impure
From wordnet.princeton.edu