Emily Dickinson Lexicon

COOL, a. [Sax. col; D. koel; G. kühl; Sw. kall; Dan. kold, kiöler, to cool; kulde, chilliness; kuler, to blow strong.]

1. Moderately cold; being of a temperature between hot and cold; as, cool air; cool water.
2. Not ardent or zealous; not angry; not fond; not excited by passion of any kind; indifferent; as, a cool friend; a cool temper; a cool lover.
3. Not hasty; deliberate; calm; as, a cool purpose.
4. Not retaining heat; light; as, a cool dress.