nonchalantly

Adverb
  1. In a composed and unconcerned manner (synset 400296859)
    "without more ado Barker borrowed a knife from his brigade Major and honed it on a carborundum stone as coolly as a butcher"
    same as: coolly, nervelessly
  2. In an unconcerned manner (synset 400244545)
    "glanced casually at the headlines"
    same as: casually

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