undoubtable

Adjective

Meaning

Indubitable.

Source: Webster's dictionary

Synonyms

certain indubitable positive absolute sure authoritative conclusive unmistakable unequivocal deductible undeniable irrefutable unquestionable incontrovertible definite
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Antonyms

false theoretical uncertain ambiguous obscure unreliable
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Close letter words and terms

undouble undoubled undoubtability undoubtably undoubted undoubtedly