PERTURBATION

Definition

1. noun an unhappy and worried mental state. — synonyms: disturbance, upset
2. noun (physics) a secondary influence on a system that causes it to deviate slightly.
3. noun activity that is a malfunction, intrusion, or interruption. — synonyms: disturbance
4. noun a disposition that is confused or nervous and upset. — synonyms: fluster
5. noun the act of causing disorder. — synonyms: disruption