Antonyms of adj bad-mannered

1 sense of bad-mannered

Sense 1
ill-mannered, bad-mannered, rude, unmannered, unmannerly -- (socially incorrect in behavior; "resentment flared at such an unmannered intrusion")

INDIRECT (VIA impolite) -> polite -- (showing regard for others in manners, speech, behavior, etc.)

Similarity of adj bad-mannered

1 sense of bad-mannered

Sense 1
ill-mannered, bad-mannered, rude, unmannered, unmannerly -- (socially incorrect in behavior; "resentment flared at such an unmannered intrusion")
       => impolite (vs. polite) -- (not polite)