📖 WordNook

perturbation

noun
  1. the act of causing disorder
    disruption
  2. a disposition that is confused or nervous and upset
    fluster
  3. activity that is a malfunction, intrusion, or interruption
    “the term `distress' connotes some degree of perturbation and emotional upset”
    disturbance
  4. (physics) a secondary influence on a system that causes it to deviate slightly
  5. an unhappy and worried mental state
    upsetdisturbance