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

cool adjective (CALM) C1 calm and not worried or frightened; not influenced by strong feeling of any kind:

cool adjective (CALM) C1 calm and not worried or frightened; not influenced by strong feeling of any kind:

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

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.