doubtful; marked by or occasioning doubt

a dubious reply.

of doubtful quality or propriety; questionable

a dubious compliment; a dubious transaction.

of uncertain outcome

in dubious battle.

wavering or hesitating in opinion; inclined to doubt.

adjective

certain , definite , doubtless , positive , reliable , sure , trustworthy , trusty , undoubtful , clear , unambiguous , unobscure

adjective

arguable , chancy , debatable , diffident , disputable , dubitable , equivocal , far-fetched , fishy * , fly-by-night * , hesitant , iffy * , improbable , indecisive , moot , mootable , open , perplexed , problematic , questionable , reluctant , shady , skeptical , suspect , suspicious , touch and go , trustless , unassured , uncertain , unclear , unconvinced , undecided , undependable , unlikely , unreliable , unsure , untrustworthy , untrusty , waveringnotes:a person is capable of doubting , whereas a thing is dubitable ; dubious , unlike doubtful , carries the connotation of suspicion , ambiguous , disinclined , doubtful , indefinite , indeterminate , mistrustful , obscure , problematical , unsettlednotes:a person is capable of doubting , borderline , clouded , inconclusive , fishy , iffy , shaky , undetermined , vague