marvelous vs unbelievable

marvelous and unbelievable both are adjectives.

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

marvelous (adjective)	unbelievable (adjective)
extraordinarily good or great; used especially as intensifiers	beyond belief or understanding
too improbable to admit of belief	having a probability too low to inspire belief
being or having the character of a miracle