Etymology
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incontestable (adj.)

"not admitting of dispute or debate, too clear to be controverted," 1670s, from in- "not" (see in- (1)) + contestable (see contest (v.)). Perhaps from or modeled on French incontestable. Related: Incontestably.

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Definitions of incontestable

incontestable (adj.)
incapable of being contested or disputed;
Synonyms: incontestible
incontestable (adj.)
not open to question; obviously true;
From wordnet.princeton.edu