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English definition of “unflappable”

unflappable

adjective uk   /ʌnˈflæp.ə.bl̩/ us  
not likely to get worried, nervous, or angry even in difficult situations: She's totally unflappable - you have to be when working in such a highly-pressured environment.Calm and relaxed
(Definition of unflappable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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