Related to anger and disappointment, it arises from the perceived resistance to the fulfillment of individual will. The greater the obstruction, and the greater the will, the more the frustration is likely to be. Causes of frustration may be internal or external.
I recomend not using Wikipedia since not all its facts are true so maybe if you use a wesite with .org in it , it's better since the facts they give are way more true and logical.
