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 : coolly, nervelessly
Meaning : In an unconcerned manner.
Example :
Glanced casually at the headlines.
Synonyms : casually
Nonchalantly meaning in Bengali (Bangla).