ungodly vs sinful

ungodly and sinful both are adjectives.

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

As adjectives, ungodly and sinful are synonyms defined as:

ungodly and sinful: characterized by iniquity; wicked because it is believed to be a sin

Other synonyms of ungodly include iniquitous.

ungodly (adjective)	sinful (adjective)
characterized by iniquity; wicked because it is believed to be a sin	far more than usual or expected
	having committed unrighteous acts
	characterized by iniquity; wicked because it is believed to be a sin