Source : Webster's Revised Unabridged Dictionary (1913)

Coolly \Cool"ly\, a.
   Coolish; cool. [Obs.] --Spenser.

Coolly \Cool"ly\, adv.
   In a cool manner; without heat or excessive cold; without
   passion or ardor; calmly; deliberately; with indifference;
   impudently.

Source : WordNet®

coolly
     adv : in a composed and unconcerned manner; "without more ado
           Barker borrowed a knife from his brigade Major and
           honed it on a carborundum stone as coolly as a butcher"
           [syn: {nervelessly}, {nonchalantly}]