Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of doubtful is as below...

Authentic :: Authentic (n.) Having a genuine original or authority, in opposition to that which is false, fictitious, counterfeit, or apocryphal; being what it purports to be; genuine; not of doubtful origin; real; as, an authentic paper or register..

Indubious :: Indubious (a.) Not dubious or doubtful; certain.

Incertain :: Incertain (n.) Uncertain; doubtful; unsteady.

Ambiguous :: Ambiguous (a.) Doubtful or uncertain, particularly in respect to signification; capable of being understood in either of two or more possible senses; equivocal; as, an ambiguous course; an ambiguous expression..

Amphibological :: Amphibological (a.) Of doubtful meaning; ambiguous.

Questionable :: Questionable (a.) Liable to question; subject to be doubted or called in question; problematical; doubtful; suspicious.

Apocryphal :: Apocryphal (a.) Not canonical. Hence: Of doubtful authority; equivocal; mythic; fictitious; spurious; false.

Dubitative :: Dubitative (a.) Tending to doubt; doubtful.

Doubtfulness :: Doubtfulness (n.) Uncertainty of meaning; ambiguity; indefiniteness.

Precarious :: Precarious (a.) Held by a doubtful tenure; depending on unknown causes or events; exposed to constant risk; not to be depended on for certainty or stability; uncertain; as, a precarious state of health; precarious fortunes..

Indubitable :: Indubitable (a.) Not dubitable or doubtful; too evident to admit of doubt; unquestionable; evident; apparently certain; as, an indubitable conclusion..

Dubiosity :: Dubiosity (n.) The state of being doubtful; a doubtful statement or thing.

Incertum :: Incertum (a.) Doubtful; not of definite form.

Mammer :: Mammer (v. i.) To hesitate; to mutter doubtfully.

Ambiguously :: Ambiguously (adv.) In an ambiguous manner; with doubtful meaning.

Philippium :: Philippium (n.) A rare and doubtful metallic element said to have been discovered in the mineral samarskite.

Critical :: Critical (n.) Pertaining to, or indicating, a crisis, turning point, or specially important juncture; important as regards consequences; hence, of doubtful issue; attended with risk; dangerous; as, the critical stage of a fever; a critical situation..

Mangrove :: Mangrove (n.) The name of one or two trees of the genus Rhizophora (R. Mangle, and R. mucronata, the last doubtfully distinct) inhabiting muddy shores of tropical regions, where they spread by emitting aerial roots, which fasten in the saline mire and eventually become new stems. The seeds also send down a strong root while yet attached to the parent plant..

Alias :: Alias (adv.) Otherwise; otherwise called; -- a term used in legal proceedings to connect the different names of any one who has gone by two or more, and whose true name is for any cause doubtful; as, Smith, alias Simpson..

Norwegium :: Norwegium (n.) A rare metallic element, of doubtful identification, said to occur in the copper-nickel of Norway..

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