This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Difficult or impossible to deny; irrefutable: undeniable facts.

adj. irrefutable, or impossible to deny

adj. Not deniable; incapable of denial; palpably true; indisputable; obvious.

adj. Unobjectionable; unquestionably excellent.

Incapable of being denied; indisputable; evidently true: as, undeniable evidence; his ability is undeniable.

Decidedly and unmistakably good; excellent.

Synonyms Indubitable, incontrovertible, unquestionable, incontestable.

adj. not possible to deny

"He presented what he called undeniable evidence Saddam Hussein had weapons of mass destruction."

incontrovertible    incontestable    indisputable    irrefutable    undisputable    positive   

unquestionable    indisputable    undisputable   

indisputable    obvious    unobjectionable    unquestionable    incontestable    incontrovertible    irrefutable    irrefragable   

liable    pliable    reliable    unjustifiable    unreliable    unverifiable    viable   

unquestionable    unmistakable    indisputable    overwhelm    intrinsic    palpable    indubitable    tangible    indescribable    incontrovertible