ill-mannered vs bad-mannered

ill-mannered and bad-mannered both are adjectives.

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

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

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

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