fabulous vs unbelievable

fabulous and unbelievable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fabulous	No	Yes	No	No
unbelievable	No	Yes	No	No

fabulous (adjective)	unbelievable (adjective)
barely credible	beyond belief or understanding
extremely pleasing	having a probability too low to inspire belief
based on or told of in traditional stories; lacking factual basis or historical validity