English

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

 

imperturbable

 adjective
adjective
BrE BrE//ˌɪmpəˈtɜːbəbl//
 
; NAmE NAmE//ˌɪmpərˈtɜːrbəbl//
 
(formal)
 
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not easily upset or worried by a difficult situation; calm His normally imperturbable secretary burst into tears. Word Origin late Middle English: from late Latin imperturbabilis, from in- ‘not’ + perturbare (from per- ‘completely’ + turbare ‘disturb’).
See the Oxford Advanced American Dictionary entry: imperturbable