credible

adjectives

capable of being believed
"completely credible testimony"; "credible information"
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antonym
(a common but incorrect usage where `credulous' would be appropriate) credulous
"she was not the...credible fool he expected"
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disposed to believe on little evidence
"the gimmick would convince none but the most credulous"
appearing to merit belief or acceptance
"a credible witness"
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is derived from
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causing one to believe the truth of something
"a convincing story"; "a convincing manner"