unlawful vs illicit

unlawful and illicit both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unlawful	No	Yes	No	No
illicit	No	Yes	No	No

As adjectives, unlawful and illicit are synonyms defined as:

Other synonyms of unlawful include illegitimate, outlaw, outlawed.

unlawful (adjective)	illicit (adjective)
contrary to or prohibited by or defiant of law	contrary to accepted morality (especially sexual morality) or convention
contrary to or forbidden by law	contrary to or forbidden by law
having no legally established claim
not morally right or permissible
not conforming to legality, moral law, or social convention