44 synonyms for in doubt such as divided, ambiguous, ambivalent, and dithering. In doubt is a noun, and its antonyms are sure and confident.
Ambiguous, confused, debatable, doubtful, iffy, in limbo, in no man's land, in the balance, moot, open to debate, open to question, pending, problematic, uncertain, unconfirmed, undecided, unknown, unresolved, unsettled, unsure, and up in the air.
Ambivalent, dithering, divided, doubtful, faltering, fluctuating, hesitant, in a quandary/dilemma, in two minds, indefinite, irresolute, shilly-shallying, sitting on the fence, teetering, tentative, uncertain, undecided, undetermined, unresolved, unsure, vacillating, and wavering.