Etymology
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irrefutable (adj.)

"incapable of being disproved," 1610s, from Late Latin irrefutabilis "irrefutable," from assimilated form of in- "not, opposite of" (see in- (1)) + refutabilis "refutable," from refutare (see refute). Related: Irrefutably; irrefutability.

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Definitions of irrefutable

irrefutable (adj.)
impossible to deny or disprove;
an irrefutable argument
From wordnet.princeton.edu