Feeling anxious, unsettled, or disturbed by something that disrupts one's peace of mind. The emotion suggests being thrown off balance by unexpected or troubling circumstances.
From Latin 'perturbare' meaning 'to disturb greatly,' from 'per-' (thoroughly) plus 'turbare' (to disturb, confuse). Originally used in astronomy to describe celestial bodies knocked off their regular orbits.
The astronomical origin of 'perturbed' is fascinating — just as planets can be knocked off their orbital path by gravitational forces, we can be knocked off our emotional equilibrium by disturbing events. This metaphor perfectly captures how external forces can disrupt our psychological stability.
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