Etymology
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unusual (adj.)

1580s, from un- (1) "not" + usual (adj.). Related: Unusually.

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Definitions of unusual

unusual (adj.)
not usual or common or ordinary;
a scene of unusual beauty
an unusual meteorite
a man of unusual ability
cruel and unusual punishment
unusual (adj.)
not commonly encountered;
two-career families are no longer unusual
unusual (adj.)
being definitely out of the ordinary and unexpected; slightly odd or even a bit weird;
Synonyms: strange
From wordnet.princeton.edu