The Collaborative International Dictionary of English v.0.48:
Discouraging \Dis*cour"a*ging\, a. Causing or indicating discouragement. -- Dis*cour"a*ging*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
discouragingly adv 1: in a discouraging manner; "the failure rate on the bar exam is discouragingly high" [ant: encouragingly]