Frustration

Noun

1. The feeling of annoyance at impossibility from resistance or inability to achieve something.
2. The act of frustrating, or the state, or an instance of being frustrated. The state of contract that allows a party to back away from its contractual obligations due to (unforeseen) radical changes to the nature of the thing a party has been obligated to.
3. The state of contract that allows a party to back away from its contractual obligations due to (unforeseen) radical changes to the nature of the thing a party has been obligated to.
4. A thing that frustrates.
5. Anger not directed at anything or anyone in particular.