the ability to stay calm and act in a reasonable way even in difficult situations

Her coolness in an emergency was admirable. 她在危急关头表现出的冷静沉着令人钦佩。

behaviour that shows no warm feelings or friendliness

I noticed a certain coolness between your parents. 我注意到你父母彼此间有些冷漠。

the quality of being slightly cold

There's a slight coolness in the air - do you think it's going to rain? 空气中有一丝凉意——你觉得会下雨吗？