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incontrovertible (adj.)

1640s, from in- (1) "not" + controvertible (see controvert). Related: Incontrovertibly; incontrovertibility.

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Definitions of incontrovertible from WordNet

incontrovertible (adj.)
impossible to deny or disprove;
incontrovertible proof of the defendant's innocence
Synonyms: irrefutable / positive
incontrovertible (adj.)
necessarily or demonstrably true;
Synonyms: demonstrable
From wordnet.princeton.edu