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Cool Cool, a. [Compar. Cooler; superl. Coolest.] [AS. c[=o]l; akin to D. koel, G. k["u]hl, OHG. chouli, Dan. k["o]lig, Sw. kylig, also to AS. calan to be cold, Icel. kala. See Cold, and cf. Chill.] 1. Moderately cold; between warm and cold; lacking in warmth; producing or promoting coolness. Fanned with cool winds. --Milton. 2. Not ardent, warm, fond, or passionate; not hasty; deliberate; exercising self-control; self-possessed; dispassionate; indifferent; as, a cool lover; a cool debater. For a patriot, too cool. --Goldsmith. 3. Not retaining heat; light; as, a cool dress. 4. Manifesting coldness or dislike; chilling; apathetic; as, a cool manner. 5. Quietly impudent; negligent of propriety in matters of minor importance, either ignorantly or willfully; presuming and selfish; audacious; as, cool behavior. Its cool stare of familiarity was intolerable. --Hawthorne. 6. Applied facetiously, in a vague sense, to a sum of money, commonly as if to give emphasis to the largeness of the amount. He had lost a cool hundred. --Fielding. Leaving a cool thousand to Mr. Matthew Pocket. --Dickens. Syn: Calm; dispassionate; self-possessed; composed; repulsive; frigid; alienated; impudent., Cooler Cool"er, n. That which cools, or abates heat or excitement. if acid things were used only as coolers, they would not be so proper in this case. --Arbuthnot. 2. Anything in or by which liquids or other things are cooled, as an ice chest, a vessel for ice water, etc.