unbelievable vs fabulous

unbelievable and fabulous both are adjectives.

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

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