Doubtful

Antonyms of DOUBTFUL

earthly, undoubted, lucid, believing, certain, plain, convinced, determined, decided, sure, settled, strong, unproblematic, confident, implicit, exact, trustworthy, evident, definite, undisputed, manifest, confirmed, clear, safe, imaginable, hands down, Questionless, self-assured, unquestionable, perspicuous, trusty, stable, open-and-shut, uncontested, unambiguous, obvious, decisive, unequivocal, unwavering, trusting, Indubious, resolved, potential, undebatable, secure, distinct, unquestioned.

Examples of usage:

But it is very doubtful." "My Little Lady" by Eleanor Frances Poynter
There is hardly anything doubtful or open to double interpretation in the order of business, when more closely examined. "Letters From Rome on the Council" by Johann Joseph Ignaz von DÃ¶llinger

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