Is cool formal or informal?

It is common in both speech and writing, but the slang meaning is more informal.

What is the difference between cool and cold?

Cool means slightly cold. Cold means much lower in temperature.

Can I say a person is cool in business writing?

Usually yes, but only if you mean calm or impressive. Avoid slang in formal reports.

← Dictionary

cool

/kuːl/

IELTSAcademic

adjective

1.
Fairly cold, or not warm. It can also mean keeping calm and not showing strong emotion.
- The water felt cool on my skin.
- Stay cool during the interview.
2.
Used about a person, style, or idea that seems attractive, calm, or impressive in a relaxed way.
- Her jacket looks really cool.
- He is very cool under pressure.

verb

To become less hot, or to make something less hot.

Let the tea cool for two minutes.
The engine cooled slowly.

Adinary Nuance

Cool is closer to 'not warm' or 'calm' than to 'good' in every situation. Compared with cold, it is softer and less extreme. Compared with nice or great, it often adds a sense of style, calmness, or approval.

In other languages

Vietnamese: mát mẻ
Spanish: fresco
Chinese: 凉爽
Japanese: 涼しい
Korean: 시원한

Etymology

Cool comes from Old English cōl, meaning 'not hot'. It has been used in English since early times, and later gained newer slang meanings.

Common phrases

cool weatherkeep coolcool downcool idea

Synonyms

chilly calm relaxed smart

Related words

cold fresh trendy composed

Frequently asked questions

Is cool formal or informal?: It is common in both speech and writing, but the slang meaning is more informal.
What is the difference between cool and cold?: Cool means slightly cold. Cold means much lower in temperature.
Can I say a person is cool in business writing?: Usually yes, but only if you mean calm or impressive. Avoid slang in formal reports.