Not settled in opinion; undetermined; wavering; hesitating in belief; also used, metaphorically, of the body when its action is affected by such a state of mind; as, we are doubtful of a fact, or of the propriety of a measure.
Admitting of doubt; not obvious, clear, or certain; questionable; not decided; not easy to be defined, classed, or named; as, a doubtful case, hue, claim, title, species, and the like.
Characterized by ambiguity; dubious; as, a doubtful expression; a doubtful phrase.
A civilized society is one which tolerates eccentricity to the point of doubtful sanity. Robert Frost
Although a skillful flatterer is a most delightful companion if you have him all to yourself, his taste becomes very doubtful when he takes to complimenting other people. Charles Dickens
In doubtful cases the more liberal interpretation must always be preferred. Marcus Tullius Cicero
I put forward formless and unresolved notions, as do those who publish doubtful questions to debate in the schools, not to establish the truth but to seek it. Michel de Montaigne
A doubtful friend is worse than a certain enemy. Let a man be one thing or the other, and we then know how to meet him. Aesop
doubtful in Dutch is dubieus, twijfelachtig, discutabel
doubtful in German is zweifelhaftes, fraglich
doubtful in Latin is incertus
doubtful in Portuguese is duvidoso
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