1590s, from un- (1) "not" + past participle of parallel (v.). Unparallel as an adjective is recorded from 1650s.
unparalleled athletic ability
a breakdown of law unparalleled in our history
unostentatious
unowned
unpack
unpaid
unpalatable
unparalleled
unpardonable
unpatriotic
unpaved
unpenetrable
unperceived
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