| n. | 1. | The state of being cool; a moderate degree of cold; a moderate degree, or a want, of passion; want of ardor, zeal, or affection; calmness. |
| 2. | Calm impudence; self-possession. |
| Noun | 1. | coolness - the property of being moderately cold; "the chilliness of early morning" Synonyms: chilliness |
| 2. | coolness - calm and unruffled self-assurance; "he performed with all the coolness of a veteran" Synonyms: imperturbability, imperturbableness | |
| 3. | coolness - fearless self-possession in the face of danger Synonyms: nervelessness | |
| 4. | coolness - a lack of affection or enthusiasm |