Slightly cold, or very hip

adjective

1. Moderately cold lacking in warmth

   "The plant grows best in cool climates."

2. Marked by steady dispassionate calmness and self-control

   "a cool and calculating businessperson"

3. Lacking ardor or friendliness

   "a cool impersonal manner"

4. Marked by restrained emotion and the frequent use of counterpoint
5. Free from tensions or violence

   "We used to fight, but we're cool now."

6. Used as an intensive
7. Marked by deliberate effrontery or lack of due respect or discretion

   "a cool reply"

8. Facilitating or suggesting relief from heat

   "a cool dress"

9. Producing an impression of being cool
10. Relatively lacking in timbre or resonance see resonance
11. Very good excellent

    "That was a really cool movie."

12. Fashionable, hip

    "… not happy with the new shoes … because they were not "cool.""

verb

1. To become cool lose heat or warmth

   "placed the pie in the window to cool"

2. To lose ardor or passion

   "His anger cooled."

3. To make cool impart a feeling of coolness to

   "cooled the room with a fan"

4. To moderate the heat, excitement, or force of calm

   "cooled her growing anger"

5. To slow or lessen the growth or activity of

noun

1. A cool time, place, or situation

   "the cool of the evening"

2. Absence of excitement or emotional involvement detachment

   "… must surrender his fine cool and enter the closed crazy world of suicide …"

3. Poise, composure

   "The player lost his cool and began yelling at the referee."

4. Hipness

adverb

1. In a casual and nonchalant manner

   "play it cool"

interjection

1. Used like cool to express agreement or approval

noun

1. Someone who remains calm and is not easily upset

idiom

1. Not upset not very bothered by things

   "My brother is always calm, cool, and collected."

idiom

1. To stay calm

   "It is important to keep a cool head in a crisis."

idiom

1. To remain calm

   "It is important to keep/stay cool in a crisis."

idiom

1. To act calm

   "She didn't want to seem too eager, so she decided to play it cool."