Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
discouragement [dɪsˈkʌrɪdʒmənt] n (feeling) разочарова́ние
to act as a discouragement to sb отбива́ть (отби́ть*perf) охо́ту у кого́-н or +infin or к +dat
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.