demonic vs unholy

demonic and unholy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
demonic	No	Yes	No	No
unholy	No	Yes	No	No

As adjectives, demonic and unholy are synonyms defined as:

demonic and unholy: extremely evil or cruel; expressive of cruelty or befitting hell

Other synonyms of demonic include diabolic, diabolical, fiendish, hellish, infernal, satanic.

demonic (adjective)	unholy (adjective)
extremely evil or cruel; expressive of cruelty or befitting hell	not hallowed or consecrated
	extremely evil or cruel; expressive of cruelty or befitting hell
	having committed unrighteous acts