Cool is a word with several related meanings. It can describe low temperatureHow hot or cold something is., calm self-controlThe ability to stay calm and manage feelings or actions., something fashionablePopular and stylish at a particular time., or a friendly way of saying something is fine. The exact meaning depends on how it is used.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-27. AI assessment; not a guarantee of accuracy.
Pronunciation
AI-generated pronunciation audio (OpenAI).
Accent: General American English
IPA: /kul/
Easy pronunciation: KOOL (approximate spelling).
Stress: One syllable, stressed on the only syllable.
Pronounced for the adjective meaning slightly cold or pleasantly not warm.
Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-27. AI assessment; not a guarantee of accuracy.
Cool Meaning
slightly cold or pleasantly not warm
Part of speech: adjective
Definition: neither warm nor very cold; giving relief from heat
Example: It was a cool evening after the hot day.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-27. AI assessment; not a guarantee of accuracy.
Other Meanings of Cool
Meaning 2
calm and steady when under pressure
Part of speech: noun
Definition: great coolness and composure under strain
Example: She kept her cool during the interview.
Synonyms for this meaning:
- aplomb — A confident calmness in difficult situations.
- assuredness — Close in some contexts, but broader and less idiomatic than the other options.
- poise — Natural substitute for calm self-control and balance under pressure.
- sang-froid — Means composure in a difficult situation.
Meaning 3
calm and not showing strong emotion
Part of speech: adjective
Definition: marked by calm self-control (especially in trying circumstances); unemotional
Example: She stayed cool during the argument.
Synonyms for this meaning:
- coolheaded — Direct synonym for calm, sensible self-control.
- nerveless — Can mean not showing nervousness, though it is less common.
Meaning 4
reduce the temperature of something
Part of speech: verb
Definition: make cool or cooler
Example: Let the soup cool for a few minutes before serving.
Synonyms for this meaning:
- chill — Works as a verb meaning to make something cooler.
- cool down — Directly matches this sense.
Meaning 5
become less hot
Part of speech: verb
Definition: loose heat
Example: The engine cooled overnight.
Synonyms for this meaning:
- chill — Works when something becomes cooler.
- cool down — Direct match for becoming less hot.
Meaning 6
become less strong, active, or enthusiastic
Part of speech: verb
Definition: lose intensity
Example: Interest in the project cooled after the first month.
Synonyms for this meaning:
- cool down — Works for feelings or activity becoming less intense.
- cool off — Natural in this sense, especially for emotions or excitement.
Meaning 7
fine or okay
Part of speech: adjective
Definition: being satisfactory or in satisfactory condition
Example: If that works for you, cool.
Synonyms for this meaning:
- all right — Very common everyday substitute.
- fine — Works well in this sense.
- hunky-dory — Informal and less common, but matches the sense.
- o.k. — Common informal equivalent.
- ok — Common informal equivalent.
- okay — Common informal equivalent.
Meaning 8
fashionable, impressive, or socially confident
Part of speech: adjective
Definition: fashionable and attractive at the time; often skilled or socially adept
Example: That jacket looks really cool.
Meaning 9
having a cold-looking color or effect
Part of speech: adjective
Definition: inducing the impression of coolness; used especially of greens and blues and violets when referring to color
Example: The room was painted in cool blues and greens.
Meaning 10
distant, unfriendly, or not enthusiastic
Part of speech: adjective
Definition: psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike
Example: They gave him a cool reception.
Meaning 11
the pleasant feeling of low temperature
Part of speech: noun
Definition: the quality of being at a refreshingly low temperature
Example: We enjoyed the cool of the evening.
Meaning 12
used to mean a large amount, especially in money expressions
Part of speech: adjective
Definition: used of a quantity or amount (especially of money) for emphasis
Example: He won a cool million dollars.
Reviewed with OpenAI Decisions. Assessment: inaccurate — correction needed. Checked: 2026-10-27. AI assessment; not a guarantee of accuracy.
Cool Synonyms
Similar Meaning
- all right
- fine
- okay
- ok
- o.k.
calm self-control under pressure
- aplomb
- poise
- sang-froid
- coolheaded
become less hot / reduce temperature
- chill
- cool down
lose intensity
- cool down
- cool off
Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-27. AI assessment; not a guarantee of accuracy.
Common Mistakes
- Do not mix up cool meaning 'slightly cold' with cool meaning 'calm' or 'fashionable'.
- Cool as a noun often means the pleasant low temperature itself, not the adjective meaning.
- In casual speech, cool can simply mean 'okay' or 'fine'.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-27. AI assessment; not a guarantee of accuracy.
Frequently Asked Questions
What is the most common meaning of cool?
The most common everyday meaning is 'slightly cold' or 'pleasantly not warm,' as in a cool day or cool water.
What are the best synonyms for cool?
It depends on the sense. For temperature, good synonyms include cool in the literal sense only in related phrasing, or sometimes chilly. For approval, okay, fine, and all right work well. For calm under pressure, poise and aplomb are strong choices.
Is cool always an adjective?
No. It can be an adjective, a verb, or a noun, depending on the meaning.
Does cool mean fashionable?
Yes. In informal English, cool can mean stylish, impressive, or socially attractive.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-27. AI assessment; not a guarantee of accuracy.
