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adverb uk /ˌɪm.pəˈtɜː.bə.bli/ us /ˌɪm.pɚˈtɝː.bə.bli/ formal
(Definition of “imperturbable” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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can't hear yourself think
If you cannot hear yourself think, you cannot give your attention to anything because there is so much noise.