| cool | (adjective) neither warm nor very cold; giving relief from heat | - |
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| (adjective) psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike | - |
| (adjective) inducing the impression of coolness; used especially of greens and blues and violets when referring to color | - |
| (adjective) marked by calm self-control (especially in trying circumstances); unemotional | Synonyms: coolheaded, nerveless |
| (adjective) fashionable and attractive at the time; often skilled or socially adept | - |
| (adjective) being satisfactory or in satisfactory condition | Synonyms: all right, fine, hunky-dory, o.k., ok, okay |
| (adjective) used of a quantity or amount (especially of money) for emphasis | - |
| (noun) the quality of being at a refreshingly low temperature | - |
| (noun) great coolness and composure under strain | Synonyms: aplomb, assuredness, poise, sang-froid |
| (verb) loose heat | Synonyms: chill, cool down |
| (verb) make cool or cooler | Synonyms: chill, cool down |
| (verb) lose intensity | Synonyms: cool down, cool off |
| coolant | (noun) a fluid agent (gas or liquid) that produces cooling; especially one used to cool a system by transferring heat away from one part to another | - |
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| cooler | (noun) a refrigerator for cooling liquids | Synonyms: ice chest |
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| (noun) a cell for violent prisoners | Synonyms: tank |
| (noun) an iced drink especially white wine and fruit juice | - |
| coolheaded | (adjective) marked by calm self-control (especially in trying circumstances); unemotional | Synonyms: cool, nerveless |
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| coolie | (noun) (ethnic slur) an offensive name for an unskilled Asian laborer | Synonyms: cooly |
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| cooling | (noun) a mechanism for keeping something cool | Synonyms: cooling system |
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| (noun) the process of becoming cooler; a falling temperature | Synonyms: chilling, temperature reduction |
| coolly | (adverb) in a composed and unconcerned manner | Synonyms: nervelessly, nonchalantly |
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| coolness | (noun) the property of being moderately cold | Synonyms: chilliness, nip |
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| (noun) a lack of affection or enthusiasm | Synonyms: chilliness, coldness, frigidity, frigidness, iciness |
| (noun) fearless self-possession in the face of danger | Synonyms: nervelessness |
| (noun) calm and unruffled self-assurance | Synonyms: imperturbability, imperturbableness |
| coolwart | (noun) stoloniferous white-flowered spring-blooming woodland plant | Synonyms: false miterwort, false mitrewort, foamflower, Tiarella cordifolia |
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| cooly | (noun) (ethnic slur) an offensive name for an unskilled Asian laborer | Synonyms: coolie |
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