Etymology
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coolly (adv.)

1570s, "without haste or passion," from cool (adj.) + -ly (2). From 1610s as "without heat;" 1620s as "in an indifferent manner;" 1844 as "with quiet presumption or impudence."

updated on March 21, 2018

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Definitions of coolly from 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
Synonyms: nervelessly / nonchalantly
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.