c. 1600, from un- (1) "not" + questionable (adj.). Related: Unquestionably.
unquestionable authority
an unquestionable antique
an unquestionable (or unequivocal) loss of prestige
unpunctual
unpunished
unqualified
unquantifiable
unquenchable
unquestionable
unquestioned
unquiet
unquote
unravel
unreachable
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