cool

/ˈkül/

Middle English col, going back to Old English cōl, going back to West Germanic *kōlu- (whence also Middle Dutch coele "moderately cold" and, from a variant *kōlja-, Old High German kuoli), lengthened-grade derivative from the base of *kalan- "to be cold"

adjective

  1. moderately cold : lacking in warmth

  2. marked by steady dispassionate calmness and self-control

  3. lacking ardor or friendliness

The plant grows best in cool climates.

cool composed collected unruffled imperturbable nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness. composed implies freedom from agitation as a result of self-discipline or a sedate disposition.

verb

  1. to become cool : lose heat or warmth —sometimes used with off or down

  2. to lose ardor or passion

  3. to make cool : impart a feeling of coolness to —often used with off or down

placed the pie in the window to cool

noun

  1. a cool time, place, or situation

  2. absence of excitement or emotional involvement : detachment

  3. poise, composure

the cool of the evening