impenitent vs unrepentant

impenitent and unrepentant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
impenitent	No	Yes	No	No
unrepentant	No	Yes	No	No

As adjectives, impenitent and unrepentant are synonyms defined as:

Other synonyms of impenitent include unremorseful.

impenitent (adjective)	unrepentant (adjective)
not penitent or remorseful	not penitent or remorseful
impervious to moral persuasion	stubbornly persistent in wrongdoing