WordWeb Online

1. The feeling that accompanies an experience of being thwarted in attaining your goals
   - defeat
    
2. An act of hindering someone's plans or efforts
   - thwarting, foiling
    
3. A feeling of annoyance at being hindered or criticized
   "her constant complaints were the main source of his frustration"

Derived forms: frustrations

Type of: annoyance, chafe, disappointment, hinderance, hindrance, interference, letdown, sell [Brit, informal], vexation

Encyclopedia: Frustration