Credible 1
Definition: Capable of being credited or believed; worthy of belief; entitled to confidence; trustworthy.
credible 2
Definition: appearing to merit belief or acceptance; "a credible witness"; "a plausible story"
credible 3
Definition: capable of being believed; "completely credible testimony"; "credible information"
credible 4
Definition: a common but incorrect usage where `credulous'' would be appropriate; "she was not the...credible fool he expected"