likely vs credible

likely and credible both are adjectives.

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

likely (adjective)	credible (adjective)
has a good chance of being the case or of coming about	capable of being believed
within the realm of credibility	appearing to merit belief or acceptance
expected to become or be; in prospect	(a common but incorrect usage where `credulous' would be appropriate) credulous

likely (adverb)	credible (adverb)
with considerable certainty; without much doubt