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Unshakably calm and collected: "His ... facial expression never deviated from the imperturbable mask" (Molly Worthen). See Synonyms at cool.
im′per·turb′a·bil′i·ty, im′per·turb′a·ble·ness n.
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|Noun||1.||imperturbableness - calm and unruffled self-assurance; "he performed with all the coolness of a veteran"|
calmness - a feeling of calm; an absence of agitation or excitement