incredible vs credible

incredible and credible both are adjectives.

Word	Noun	Adjective	Verb	Adverb
incredible	No	Yes	No	No
credible	No	Yes	No	No

incredible (adjective)	credible (adjective)
beyond belief or understanding	capable of being believed
	appearing to merit belief or acceptance
	(a common but incorrect usage where `credulous' would be appropriate) credulous