Definition of unperturbed adjective from the Oxford Advanced Learner's Dictionary

 

unperturbed

 adjective
adjective
BrE BrE//ˌʌnpəˈtɜːbd//
 
; NAmE NAmE//ˌʌnpərˈtɜːrbd//
 
 
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not worried or anxious She seemed unperturbed by the news. The local people remained calm and apparently unperturbed. opposite perturbed
See the Oxford Advanced American Dictionary entry: unperturbed