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1 day ago · 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.

Cool can similarly be used to describe composure and an absence of excitement or agitation in a person, especially in times of stress (as expressed in the idiom keep one's cool).

The comprehensive definition of cool. Includes pronunciation, synonyms, etymology, and usage examples to help you master this word.

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

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

Apr 30, 2026 · Dr. Erica Brozovsky of Otherwords explained the etymological origins of the word "cool", noting how it has transcended multiple generations.

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.