Definition of imperturbably adverb from the Oxford Advanced Learner's Dictionary

 

imperturbably

 adverb
adverb
BrE BrE//ˌɪmpəˈtɜːbəbli//
 
; NAmE NAmE//ˌɪmpərˈtɜːrbəbli//
 
(formal)
 
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in a calm way, without getting too upset or worried by a difficult situation