doubtful

adj.

[1]	in doubt , dubious , dubitable , dubious , questionable , in question , open to question , problematic , debatable , disputable , uncertain , unpredictable , indeterminate , unsettled , unresolved , conjectural , indefinite , unclear , obscure , vague , anybody's guess , (Colloq) up in the air
[2]	sceptical , dubious , unconvinced , distrustful , mistrustful , suspicious , uncertain , unsure , hesitant , hesitating , vacillating , indecisive
[3]	dubious , tentative , questionable , shady , louche , disreputable , controversial