Antonyms of adj unquestionable

3 senses of unquestionable

Sense 1
unquestionable (vs. questionable) -- (incapable of being questioned; "unquestionable authority")

questionable (vs. unquestionable) -- (subject to question; "questionable motives"; "a questionable reputation"; "a fire of questionable origin")
        => alleged (prenominal), so-called, supposed -- (doubtful or suspect; "these so-called experts are no help")
        => apocryphal -- (being of questionable authenticity)
        => debatable, problematic, problematical -- (open to doubt or debate; "If you ever get married, which seems to be extremely problematic")
        => doubtful, dubious, dubitable, in question (predicate) -- (open to doubt or suspicion; "the candidate's doubtful past"; "he has a dubious record indeed"; "what one found uncertain the other found dubious or downright false"; "it was more than dubitable whether the friend was as influential as she thought"- Karen Horney)
        => equivocal -- (open to question; "aliens of equivocal loyalty"; "his conscience reproached him with the equivocal character of the union into which he had forced his son"-Anna Jameson)
        => fishy, funny, shady, suspect, suspicious -- (not as expected; "there was something fishy about the accident"; "up to some funny business"; "some definitely queer goings-on"; "a shady deal"; "her motives were suspect"; "suspicious behavior")
        => impugnable -- (subject to being discredited)
        => self-styled, soi-disant -- (as claimed by and for yourself often without justification; "the self-styled `doctor' has no degree of any kind")

Sense 2
authentic, bona fide, unquestionable, veritable -- (not counterfeit or copied; "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring")

INDIRECT (VIA genuine) -> counterfeit, imitative -- (not genuine; imitating something superior; "counterfeit emotion"; "counterfeit money"; "counterfeit works of art"; "a counterfeit prince")

Sense 3
unquestionable -- (not open to question; "an unquestionable (or unequivocal) loss of prestige")

INDIRECT (VIA unequivocal) -> equivocal, ambiguous -- (open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead; "an equivocal statement"; "the polling had a complex and equivocal (or ambiguous) message for potential female candidates"; "the officer's equivocal behavior increased the victim's uneasiness"; "popularity is an equivocal crown"; "an equivocal response to an embarrassing question")

Similarity of adj unquestionable

3 senses of unquestionable

Sense 1
unquestionable (vs. questionable) -- (incapable of being questioned; "unquestionable authority")
       => acknowledged -- (generally accepted)
       => beyond doubt (predicate), indubitable -- (too obvious to be doubted)
       => for sure -- (not open to doubt; "she wanted to go; that was for sure")
       => mathematical -- (beyond question; "a mathematical certainty")
       => unimpeachable -- (beyond doubt or reproach; "an unimpeachable source")
          Also See-> incontestable#1, incontestible#1; undeniable#1

Sense 2
authentic, bona fide, unquestionable, veritable -- (not counterfeit or copied; "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring")
       => genuine (vs. counterfeit), echt -- (not fake or counterfeit; "a genuine Picasso"; "genuine leather")

Sense 3
unquestionable -- (not open to question; "an unquestionable (or unequivocal) loss of prestige")
       => unequivocal (vs. equivocal), univocal, unambiguous -- (admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion; "unequivocal evidence"; "took an unequivocal position"; "an unequivocal success"; "an unequivocal promise"; "an unequivocal (or univocal) statement")