'Frustration' definitions:

Definition of 'frustration'

From: WordNet
noun
The feeling that accompanies an experience of being thwarted in attaining your goals [syn: frustration, defeat]
noun
An act of hindering someone's plans or efforts [syn: frustration, thwarting, foiling]
noun
A feeling of annoyance at being hindered or criticized; "her constant complaints were the main source of his frustration"

Definition of 'Frustration'

From: GCIDE
  • Frustration \Frus*tra"tion\, n. [L. frustratio: cf. OF. frustration.] The act of frustrating; disappointment; defeat; as, the frustration of one's designs. [1913 Webster]

Synonyms of 'frustration'

From: Moby Thesaurus