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May 23, 2026 · cool, composed, collected, unruffled, imperturbable, nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness.

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

Something that is cool has a temperature which is low but not very low. I felt a current of cool air. The water was slightly cooler than a child's bath. The vaccines were kept cool in refrigerators.

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

1. A cool place, part, or time: the cool of early morning. 2. The state or quality of being cool. 3. Composure; poise: "Our release marked a victory. The nation had kept its cool" (Moorhead Kennedy).

When the weather is cool, it's not quite cold but not warm either. When people are cool, they're mellow and in control.

Find 360 different ways to say COOL, along with antonyms, related words, and example sentences at Thesaurus.com.