Indubitable

Adjective

 * 1) clearly true; providing no possibility of doubt.
 * The indubitable effect of the potion convinced many unbelievers.

Synonyms

 * undoubtable

Derived terms

 * indubitably

Noun

 * 1) That which is indubitable.
 * If we build logically upwards from a few indubitables, the whole system must remain correct.

Thesaurus
absolute, actual, admitting no question, apparent, bona fide, clear, clear as crystal, confirmable, crystal-clear, demonstrable, demonstratable, discernible, distinct, down, evident, explicit, express, factual, flat, genuine, historical, inappealable, incontestable, incontrovertible, indisputable, irrefragable, irrefutable, manifest, noticeable, observable, obvious, open-and-shut, palpable, patent, perceivable, perceptible, perspicuous, plain, plain as day, provable, real, seeable, self-evident, self-explaining, self-explanatory, sure-enough, tangible, testable, to be seen, true, unanswerable, unconfutable, undeniable, undoubted, unimpeachable, unmistakable, unquestionable, unrefutable, verifiable, veritable, visible

Adjective

 * Dutch: twijfelloos, ontwijfelbaar
 * Finnish: epäilyksetön, ilmeinen
 * German: unzweifelhaft


 * Icelandic: efalaus, efalaust ; ótvíræður , ótvíræð , ótvírætt ; óhrekjandi ; vafalaus , vafalaust