1. (a.) Not questionable; as, an unquestionable title.

2. (a.) Not inviting questions or conversation.

absolute actual admitting no question ascertained attested authenticated believable bona fide categorically true certain certified clear colorable conceivable conclusive confirmable confirmed corroborated credible deep-seated definite demonstrable demonstratable demonstrated dependable determined documentary effectual esoteric established factual fiduciary flat genuine historical immanent implanted implicit inalienable inappealable incontestable incontrovertible indisputable indubitable indwelling infixed ingrained inherent inner internal intrinsic inward inwrought irreducible irrefragable irrefutable manifest not in error objectively true obvious patent plausible positive private provable proved real reliable resident secret self-evident subjective substantiated sure sure-enough tenable testable TRUE true as gospel trustworthy trusty truthful unalienable unanswerable unchallengeable unconfutable unconfuted uncontestable undeniable undenied undoubted unequivocal unerroneous unexceptionable unfallacious unfalse unimpeachable unmistakable unmistaken unrefutable unrefuted up-and-down validated veracious verifiable verified veritable very well-founded well-grounded worthy of faith