incredulous vs disbelieving

incredulous and disbelieving both are adjectives.

Word	Noun	Adjective	Verb	Adverb
incredulous	No	Yes	No	No
disbelieving	No	Yes	No	No

incredulous (adjective)	disbelieving (adjective)
not disposed or willing to believe; unbelieving	denying or questioning the tenets of especially a religion