over-the-top vs sinful

over-the-top and sinful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
over-the-top	No	Yes	No	No
sinful	No	Yes	No	No

As adjectives, over-the-top and sinful are synonyms defined as:

Other synonyms of over-the-top include extraordinary.

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