cool, calm, and collected

Cliché [of a person] very calm and poised. For example, James did very well in his TV appearances. He stayed cool, calm, and collected. The bad news didn’t seem to distress Jane at all. She remained cool, calm, and collected.
Source: McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

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