adjective see: two Date: 1548 giving rise to uncertainty: as, of doubtful promise or outcome , questionable or suspect as to true nature or quality , unsettled in opinion ; doubtful , see: doubtful ~ly adverb ~ness noun
DUBIOUS
Meaning of DUBIOUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012