The Collaborative International Dictionary of English v.0.48:
Boorish \Boor"ish\, a. Like a boor; clownish; uncultured; unmannerly. -- Boor"ish*ly, adv. -- Boor"ish*ness, n. [1913 Webster] Which is in truth a gross and boorish opinion. --Milton. [1913 Webster]WordNet (r) 3.0 (2006):
boorishly adv 1: like a boor, "he behaved boorishly at the party"