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Synonyms for undoubted

modified

assured, sure, unquestionable, indubitable, unquestioned, irrefutable, indisputable, undisputed, unchallenged, proved, proven, established, without question, settled, fixed; see also certain.

Antonyms questionable*, disputed, refuted.

See undoubted in Webster's New World Roget's A-Z Thesaurus II

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