1840, "unpierced;" 1860, "unglued," from un- (1) "not" + past participle of stick (v.).
the gears locked in second and would not come unstuck
a man with a mule got my car unstuck
price programs became unstuck because little grain was available
unstop
unstoppable
unstressed
unstring
unstrung
unstuck
unstudied
unsubscribe
unsubsidized
unsubstantial
unsubstantiated
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