Source : Webster's Revised Unabridged Dictionary (1913)

Discouraging \Dis*cour"a*ging\, a.
   Causing or indicating discouragement. --
   {Dis*cour"a*ging*ly}, adv.

Source : WordNet®

discouragingly
     adv : in a discouraging manner; "the failure rate on the bar exam
           is discouragingly high" [ant: {encouragingly}]