Perturbation

The act of perturbing, or the state of being perturbed; esp., agitation of mind.

A disturbance in the regular elliptic or other motion of a heavenly body, produced by some force additional to that which causes its regular motion; as, the perturbations of the planets are caused by their attraction on each other.

(physics) a secondary influence on a system that causes it to deviate slightly

an unhappy and worried mental state; "there was too much anger and disturbance"; "she didn't realize the upset she caused me"

a disposition that is confused or nervous and upset