1. credible (vs. incredible), believable, likely, presumptive, plausible, thinkable

usage: capable of being believed; "completely credible testimony"; "credible information"

2. credible, credulous (vs. incredulous)

usage: (a common but incorrect usage where `credulous' would be appropriate) credulous; "she was not the...credible fool he expected"

3. credible, convincing (vs. unconvincing)

usage: appearing to merit belief or acceptance; "a credible witness"

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See also: credible (Dictionary)