Definition of indubitable in English:



  • Impossible to doubt; unquestionable.

    ‘an indubitable truth’
    • ‘Meme theory strikes many as so obviously true as to be indubitable.’
    • ‘If this is so, no judgement, however modest, is absolutely indubitable.’
    • ‘This faith in the indubitable certainty of mathematical proofs was sadly shaken around 1900 by the discovery of the antinomies or paradoxes of set theory.’
    • ‘All right, Callahan, as fun as this little debate is, it's far too early for me to doubt my existence when it clearly is indubitable.’
    • ‘I certainly do not yet concede that it actually exists, until this is proved to me by an indubitable argument.’
    • ‘This is evidently about an experience, an indubitable fact (that one may think a liar, but that has been brought into being nevertheless).’
    • ‘War efforts are equated with indubitable patriotism.’
    • ‘The story has many variants, but all of them reflect an indubitable truth - China-made toys are taking a great market share in global markets.’
    • ‘One of the indubitable masterpieces of his later years is the pitiless Self-Portrait in a Dressing-Room Mirror.’
    • ‘Aristotle thus does not argue that it is a necessary truth (that is, he does not try to prove the it); rather, he argues that it is indubitable.’
    • ‘To me, the word ‘revolution’ means death, havoc, dogs of war, and a whole ton of stuff I'm not getting into unless you show me a big, indubitable reason.’
    • ‘According to Mill, many mathematical propositions are not even true at all, let alone necessarily true and indubitable, and let alone a priori knowable.’
    • ‘Pius IX made his furious rejection of liberalism and national unification indubitable upon his return to Rome.’
    • ‘They say he has used his indubitable oratorical powers to fire the blood of the mob, only to later run for cover, disavowing his responsibility for violence.’
    • ‘Also, the indubitable suffering of the many people who might be helped by stem cell therapy ought to weigh heavily in the complex moral equation.’
    • ‘This fact about induction, we are told, is the difficulty that makes science fall short of telling us indubitable truths about the world.’
    • ‘Newton repudiated the Cartesian programme of deducing scientific laws from indubitable metaphysical principles.’
    • ‘I look for the driver's expression in their rear-view mirror, but their windows are fitted with tinted glass that hides their indubitable, apoplectic rage.’
    unquestionable, undoubtable, indisputable, unarguable, inarguable, undebatable, incontestable, undeniable, irrefutable, incontrovertible, unmistakable, unequivocal, certain, sure, positive, definite, absolute, conclusive, emphatic, categorical, compelling, watertight, clear, clear-cut
    beyond doubt, beyond the shadow of a doubt, beyond dispute, beyond question, not in question, not in doubt
    irrefragable, apodictic
    View synonyms


Late Middle English: from Latin indubitabilis, from in- not + dubitabilis (see dubitable).