Definition of doubtful
1a : lacking a definite opinion, conviction, or determination They were doubtful about the advantages of the new system.
b : uncertain in outcome : undecided The outcome of the election remains doubtful.
2 : marked by qualities that raise doubts about worth, honesty, or validity of doubtful repute
3 : giving rise to doubt or uncertainty : open to question It is doubtful that they ever knew what happened. a doubtful premise
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