nonchalantly
1. [ adverb ] in a composed and unconcerned manner
Synonyms: coolly nervelessly
Examples:

"without more ado Barker borrowed a knife from his brigade Major and honed it on a carborundum stone as coolly as a butcher"

Related terms: casual cool cool casual cool
2. [ adverb ] in an unconcerned manner
Synonyms: casually
Examples:

"glanced casually at the headlines"

Related terms: casual casual casual
Similar spelling:   nonchalant
  nonchalance