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



BrE BrE//ˌɪmpəˈtɜːbəbl//
; NAmE NAmE//ˌɪmpərˈtɜːrbəbl//
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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