1. (noun)coolness, imperturbability, imperturbableness calm and unruffled self-assurance "he performed with all the coolness of a veteran"
2. (noun)chilliness, coolness, nip the property of being moderately cold "the chilliness of early morning"
3. (noun)coolness, nervelessness fearless self-possession in the face of danger
4. (noun)coldness, coolness, frigidity, frigidness, iciness, chilliness a lack of affection or enthusiasm "a distressing coldness of tone and manner"
Definition of 'coolness'
Webster Dictionary
1. (noun)coolness the state of being cool; a moderatedegree of cold; a moderate degree, or a want, of passion; want of ardor, zeal, or affection; calmness