from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Difficult or impossible to deny; irrefutable.

from The Century Dictionary.

  • Incapable of being denied; indisputable; evidently true: as, undeniable evidence; his ability is undeniable.
  • Decidedly and unmistakably good; excellent.
  • Synonyms Indubitable, incontrovertible, unquestionable, incontestable.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Not deniable; incapable of denial; palpably true; indisputable; obvious.
  • adjective colloq. Unobjectionable; unquestionably excellent.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective irrefutable, or impossible to deny

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective not possible to deny


from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ deniable


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