Feeling uncertain about something or lacking belief in its truth, reliability, or effectiveness
Examples:
She's doubtful about the project's completion on time.The detective found the alibi highly doubtful.Despite his charm, his intentions were doubtful.
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Antonyms:
Dubious
/ˈdjuːbiəs/
Feeling doubt about something or lacking trust.
Examples:
His constant excuses seemed dubious to his friends.The contract terms raised some dubious points.Detectives found her testimony rather dubious.
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Ways to tell them apart:
Both doubtful and dubious imply a lack of certainty, but doubtful is typically more neutral or factual, whereas dubious often carries a negative connotation.
Think of doubtful as simply being unsure, while dubious not only means uncertainty but also suggests suspicion or disbelief.
Doubtful can be related to uncertain outcomes, whereas dubious often implies something looks skeptical or questionable.
If youre uncertain about the truth, youre doubtful; if you think somethings fishy, youre dubious.
Remember, a doubtful person might be unsure, but a dubious character might not be trustworthy.