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What are the antonyms for DOUBTFUL?

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Synonyms for DOUBTFUL

Usage Examples for DOUBTFUL

  1. This expenditure paid in the long run, but when he entered upon it, it must have seemed very doubtful if this would be the case. - "A Short History of English Agriculture" by W. H. R. Curtler
  2. I did feel very doubtful at first. - "The Life of Nancy" by Sarah Orne Jewett
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