disturbance, perturbation, upset -- (an unhappy and worried mental state; "there was too much anger and disturbance"; "she didn't realize the upset she caused me")
perturbation -- ((physics) a secondary influence on a system that causes it to deviate slightly)
perturbation, disturbance -- (activity that is a malfunction, intrusion, or interruption; "the term `distress' connotes some degree of perturbation and emotional upset"; "he looked around for the source of the disturbance"; "there was a disturbance of neural function")
perturbation, fluster -- (a disposition that is confused or nervous and upset)
disruption, perturbation -- (the act of causing disorder)
(Sound)
