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unflappable (adj.)

1958, from un- (1) "not" + flap (v.) + -able. Originally used in reference to Harold Macmillan, British P.M. 1957-63.

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Definitions of unflappable from WordNet

unflappable (adj.)
not easily perturbed or excited or upset; marked by extreme calm and composure;
unflappable in a crisis
Synonyms: imperturbable
From wordnet.princeton.edu