imperturbable

Adjective
  1. Not easily perturbed or excited or upset;
    Marked by extreme calm and composure (synset 300532252)
    "hitherto imperturbable, he now showed signs of alarm"; "an imperturbable self-possession"; "unflappable in a crisis"
    similar to: composed - serenely self-possessed and free from agitation especially in times of stress
    same as: unflappable

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