unperturbed
Meaning
not worried or anxious; calm and undisturbed.
Structure
Usage
she remained unperturbed by the sudden change in plans.
his unperturbed expression gave no hint of the inner turmoil he might have felt.
the old sailor was unperturbed by the gathering storm clouds.
Etymology
The word 'unperturbed' is formed by adding the common English negative prefix 'un-' to the adjective 'perturbed'. The core, 'perturb', originates from Latin 'perturbare', a compound of 'per-' (thoroughly) and 'turbare' (to disturb, agitate), itself from 'turba' (a crowd, tumult). This literal sense of being thoroughly disturbed or thrown into disorder evolved into the modern meaning of being anxious or agitated. Therefore, 'unperturbed' logically and directly signifies the state of not being disturbed or agitated, maintaining a calm and composed demeanor.
Analysis
un- (a prefix of Germanic origin, via Old English, indicating negation or reversal). perturbed (from the past participle of 'perturb', from Latin 'perturbare', meaning to throw into confusion).