From The Collaborative International Dictionary of English v.0.48 :
Unmannered \Unmannered\
See mannered.
From WordNet (r) 3.0 (2006) :
unmannered
adj 1: socially incorrect in behavior; "resentment flared at
such an unmannered intrusion" [syn: ill-mannered, bad-
mannered, rude, unmannered, unmannerly]
2: without artificiality; natural; "the doctor's quiet
unmannered entry"