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According to WIKIPEDIA:
In psychology, frustration
is a common emotional response to opposition. 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. In people, internal frustration may arise from challenges in
fulfilling personal goals and desires, instinctual drives and needs, or dealing
with perceived deficiencies, such as a lack of confidence or fear of social
situations. Conflict can also be an internal source of frustration; when one
has competing goals that interfere with one another, it can create cognitive
dissonance. External causes of frustration involve conditions outside an
individual, such as a blocked road or a difficult task. While coping with
frustration, some individuals may engage in passive–aggressive behavior, making
it difficult to identify the original cause(s) of their frustration, as the
responses are indirect. A more direct, and common response, is a propensity
towards aggression
