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May 8, 2026 · cool, composed, collected, unruffled, imperturbable, nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness.

COOL meaning: 1. slightly cold: 2. slightly cold in a pleasant way: 3. used to describe a temperature that is…. Learn more.

cool (informal) used to show that you admire or approve of something, often because it is fashionable, attractive, or different: I think their new song's really cool.

1. To become less warm: took a dip to cool off. 2. To become calmer: needed time for tempers to cool.

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COOL definition: moderately cold; neither warm nor cold. See examples of cool used in a sentence.