- (superl.) Moderately cold; between warm and cold; lacking in warmth; producing or promoting coolness.
- (superl.) Applied facetiously, in a vague sense, to a sum of money, commonly as if to give emphasis to the largeness of the amount.
- (superl.) Quietly impudent; negligent of propriety in matters of minor importance, either ignorantly or willfully; presuming and selfish; audacious; as, cool behavior.
- (superl.) Manifesting coldness or dislike; chilling; apathetic; as, a cool manner.
- (superl.) Not retaining heat; light; as, a cool dress.
- (superl.) Not ardent, warm, fond or passionate; not hasty; deliberate; exercising self-control; self-possessed; dispassionate; indifferent; as, a cool lover; a cool debater.
- (v.i.) To lose the heat of excitement or passion; to become more moderate.
- (n.) A moderate state of cold; coolness; -- said of the temperature of the air between hot and cold; as, the cool of the day; the cool of the morning or evening.
- (v.t.) To make cool or cold; to reduce the temperature of; as, ice cools water.
- (v.t.) To moderate the heat or excitement of; to allay, as passion of any kind; to calm; to moderate.
- (v.i.) To become less hot; to lose heat.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). cool. Retrieved September 20, 2026, from http://smartdefine.org/cool/definitions/1991381 |
| Chicago | Webster's. 2011. "cool" http://smartdefine.org/cool/definitions/1991381 (accessed September 20, 2026). |
| Harvard | Webster's 2011, cool, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/cool/definitions/1991381>. |
| MLA | Webster's. "cool" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/cool/definitions/1991381> |