Adjektive
discouraging {feelings & emotions}
Noun
frustration [pl. frustrations] , {feelings & emotions}
discouragement [pl. discouragements] , {feelings & emotions}
demoralization {feelings & emotions}
inhibition [pl. inhibitions]
disappointment [pl. disappointments] , {feelings & emotions}
suppression [pl. suppressions]
frustrating {feelings & emotions}
disheartenment {feelings & emotions}