unbelieving vs disbelieving

unbelieving and disbelieving both are adjectives.

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

As adjectives, unbelieving and disbelieving are synonyms defined as:

unbelieving and disbelieving: denying or questioning the tenets of especially a religion

Other synonyms of unbelieving include sceptical, skeptical.

unbelieving (adjective)	disbelieving (adjective)
holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible	denying or questioning the tenets of especially a religion
denying or questioning the tenets of especially a religion
rejecting any belief in gods