1580s in figurative sense, c. 1600 in literal sense (transitive and intransitive), from un- (2) "reverse, opposite of" + mask (v.). Related: Unmasked; unmasking.
The journal article unmasked the corrupt politician
unmask the imposter
unmannerly
unmarked
unmarketable
unmarred
unmarried
unmask
unmastered
unmatched
unmeaning
unmeasurable
unmediated
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