unholy vs sinful

unholy and sinful both are adjectives.

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

As adjectives, unholy and sinful are synonyms defined as:

Other synonyms of unholy include wicked.

unholy (adjective)	sinful (adjective)
not hallowed or consecrated	far more than usual or expected
extremely evil or cruel; expressive of cruelty or befitting hell	having committed unrighteous acts
having committed unrighteous acts	characterized by iniquity; wicked because it is believed to be a sin