Source : Webster's Revised Unabridged Dictionary (1913)

Unmannerly \Un*man"ner*ly\, a.
   Not mannerly; ill-bred; rude. -- adv. Uncivilly; rudely. --
   {Un*man"ner*li*ness}, n.

Source : WordNet®

unmannerly
     adj : socially incorrect in behavior; "resentment flared at such
           an unmannered intrusion" [syn: {ill-mannered}, {rude},
           {unmannered}]