I. “+ adverb
Etymology: Middle English unmanerly, from un- (I) + manerly, adverb, mannerly
: in an unmannerly fashion : rudely
reformers … did not unmannerly reject those offices of the church — J.J.Blunt
II. adjective
Etymology: Middle English unmanerly, from un- (I) + manerly, adjective, mannerly
: not mannerly : impolite , discourteous
disliked for his unmannerly behavior