Etymology
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unperturbed (adj.)

early 15c., from un- (1) "not" + past participle of perturb (v.).

updated on February 28, 2014

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Definitions of unperturbed from WordNet

unperturbed (adj.)
free from emotional agitation or nervous tension; "with contented mind and unruffled spirit"- Anthony Trollope;
Synonyms: unflurried / unflustered / unruffled
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.