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unquestionable (adj.)

c. 1600, from un- (1) "not" + questionable (adj.). Related: Unquestionably. Questionless (adv.) was used in the sense of "without doubt, assuredly" from early 15c.

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Definitions of unquestionable from WordNet

unquestionable (adj.)
incapable of being questioned;
unquestionable authority
unquestionable (adj.)
not counterfeit or copied;
an unquestionable antique
unquestionable (adj.)
not open to question;
an unquestionable (or unequivocal) loss of prestige
From wordnet.princeton.edu