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

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

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

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).

Jan 20, 2026 · From Middle English cool, from Old English cōl (“cool, cold, tranquil, calm”), from Proto-West Germanic *kōl (ī), from Proto-Germanic *kōlaz, *kōluz (“cool”), from Proto-Indo-European *gel- …

A moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness. In the cool of the morning.