Antonyms of adj well-mannered

2 senses of well-mannered

Sense 1
well-bred, well-mannered -- (of good upbringing)

INDIRECT (VIA refined) -> unrefined -- ((used of persons and their behavior) not refined; uncouth; "how can a refined girl be drawn to such an unrefined man?")

Sense 2
mannerly, well-mannered -- (socially correct in behavior)

INDIRECT (VIA polite) -> impolite -- (not polite)

Similarity of adj well-mannered

2 senses of well-mannered

Sense 1
well-bred, well-mannered -- (of good upbringing)
       => refined (vs. unrefined) -- ((used of persons and their behavior) cultivated and genteel; "she was delicate and refined and unused to hardship"; "refined people with refined taste")

Sense 2
mannerly, well-mannered -- (socially correct in behavior)
       => polite (vs. impolite) -- (showing regard for others in manners, speech, behavior, etc.)