Imperturbable

I think it could be either:

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stoic

'imperturbable' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for stoic that I've seen before include "Uncomplaining; philosopher" , "show little emotion" , "Uncomplaining in suffering" , "Able to endure pain" , "Person indifferent to pleasure or pain" .)

I've seen this clue in The New York Times.

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