The Collaborative International Dictionary of English v.0.48:
Unfavorable \Un*fa"vor*a*ble\, a. Not favorable; not propitious; adverse; contrary; discouraging. -- Un*fa"vor*a*ble*ness, n. -- Un*fa"vor*a*bly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
unfavorably adv 1: showing disapproval; in a disparaging way; "he reviewed the play unfavorably" [syn: unfavorably, unfavourably] [ant: favorably, favourably]