perturbation

noun

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