Synonyms and Antonyms of doubtful

1 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
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Antonyms of doubtful
2 giving good reason for being doubted, questioned, or challenged
  • the election results were highly doubtful, so an investigation was begun
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Antonyms of doubtful
3 not likely to be true or to occur
  • our winning the championship increasingly looks like a doubtful outcome
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Antonyms of doubtful
4 open to question or dispute
  • a doubtful claim to the property
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