coolness  
noun [ U ] uk/ˈkuːl.nəs/ us/ˈkuːl.nəs/
  (CALM)      
 C2 冷静,镇静,沉着
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。 
   (UNFRIENDLINESS)      
 C2 冷淡;冷漠
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。 
   (COLD)      
C1 凉意;寒冷
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?