ill-mannered vs unmannerly

ill-mannered and unmannerly both are adjectives.

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

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

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

ill-mannered (adjective)	unmannerly (adjective)
socially incorrect in behavior	socially incorrect in behavior