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unflappable

adjective
 
 
/ʌnˈflæp.ə.bl̩/

Definition

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 adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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