cool
In French, 'cool' is used similarly to English, as an adjective to describe someone or something that is impressive, enjoyable, or likeable. Though it's originally an English term, it's commonly used in informal French conversations. Note that its pronunciation in French is similar to the English pronunciation.
That's cool!
This phrase can be used to express approval or admiration of something or someone. It is a very common phrase used in casual conversations.
The weather is cool today.
This sentence indicates a pleasant weather condition. 'Cool' is used in this context to describe a mild or moderately cold temperature.
Your style is really cool.
This is a compliment about someone's sense of style. 'Cool' is being used here to express that their fashion sense is modern, trendy, and appealing.