iniquitous vs sinful

iniquitous and sinful both are adjectives.

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

As adjectives, iniquitous and sinful are synonyms defined as:

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

Other synonyms of iniquitous include ungodly.

iniquitous (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