Definition of DOUBTFUL

not feeling sure about the truth, wisdom, or trustworthiness of someone or something <he was doubtful about the decision to complete the project despite its mounting problems>
Phrases on the fence
giving good reason for being doubted, questioned, or challenged <the election results were highly doubtful, so an investigation was begun>
not likely to be true or to occur <our winning the championship increasingly looks like a doubtful outcome>
Antonyms likely, probable

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