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1. Oxford American Dictionary

   doubtful

   • IPA[ˈdoutf(ə)l]

   美式

   • adj.
     feeling uncertain about something；not known with certainty
2. • 釋義

   adj.

   形容詞

   • 1. feeling uncertain about something he looked doubtful, but gave a nod I was doubtful of my judgment 同義詞 irresolute, hesitant, tentative, vacillating, dithering, ... 更多wavering, teetering, fluctuating, faltering, ambivalent, divided, in doubt, unsure, uncertain, in two minds, shilly-shallying, undecided, indefinite, unresolved, in a quandary/dilemma, undetermined, informaliffy, blowing hot and cold, sitting on the fence反義詞 confident, decisive
   • 2. not known with certainty the fire was of doubtful origin 同義詞 in doubt, dubious, uncertain, open to question, questionable, ... 更多unsure, unconfirmed, not definite, unknown, unsettled, undecided, unresolved, debatable, open to debate, moot, in the balance, pending, in limbo, in no man's land, up in the air, confused, problematic, ambiguous, informaliffy反義詞 certain
   • ▪ improbable it is doubtful whether these programs have any lasting effect 同義詞 unlikely, improbable, not likely, dubious, unthinkable, ... 更多implausible, impossible, far-fetched, inconceivable, unimaginable, remote, beyond the bounds of possibility反義詞 probable
   • ▪ not established as genuine or acceptable of doubtful legality 同義詞 unlikely, improbable, not likely, dubious, unthinkable, ... 更多implausible, impossible, far-fetched, inconceivable, unimaginable, remote, beyond the bounds of possibility, questionable, arguable, disputable, debatable, open to question, open to debate, subject to debate, controversial, contentious, open to doubt, in doubt, dubious, borderline, rarecontrovertible, unestablished, informaliffy, dodgy反義詞 probable, sound