The Collaborative International Dictionary of English v.0.48:
Horribly \Hor"ri*bly\, adv. In a manner to excite horror; dreadfully; terribly. [1913 Webster]WordNet (r) 3.0 (2006):
horribly adv 1: of a dreadful kind; "there was a dreadfully bloody accident on the road this morning" [syn: dreadfully, awfully, horribly]