bad-mannered vs unmannerly

bad-mannered and unmannerly both are adjectives.

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

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

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

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