ice-cool

Calm and composed, especially in times of stress. I was petrified to take the stage, but Alice was ice-cool. Practicing meditation has helped me to be ice-cool in times of trouble. A: "I wish I were ice-cool like my sister in high-stress situations." B: "Well, your sister's an ER nurse, so she gets a lot of practice."

See also:

(as) cool as a cucumber
be (as) cool as a cucumber
cool as a cucumber
cucumber
cool, calm, and collected
calm, cool, and collected
collected
patient of
(as) loose as a goose
loose as a goose

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