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

 

unflappable

 adjective
adjective
BrE BrE//ˌʌnˈflæpəbl//
 
; NAmE NAmE//ˌʌnˈflæpəbl//
 
(informal)
 
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able to stay calm in a difficult situation synonym imperturbable
See the Oxford Advanced American Dictionary entry: unflappable