Meaning : In a composed and unconcerned manner.
Example :
Without more ado Barker borrowed a knife from his brigade Major and honed it on a carborundum stone as coolly as a butcher.
Synonyms : nervelessly, nonchalantly
Coolly ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Coolly ka matlab kya hota hai?