unmannered vs ill-mannered

unmannered and ill-mannered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unmannered	No	Yes	No	No
ill-mannered	No	Yes	No	No

As adjectives, unmannered and ill-mannered are synonyms defined as:

Other synonyms of unmannered include bad-mannered, rude, unmannerly.

unmannered (adjective)	ill-mannered (adjective)
socially incorrect in behavior	socially incorrect in behavior
without artificiality; natural