Meanings
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1
adv
in a composed and unconcerned manner
Without more ado they borrowed a knife and honed it as coolly as a butcher.
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2
adv
At a moderately low temperature.
The wind blew coolly.
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3
adv
In a cool, unpanicked or collected manner.
"He was here," observed Drina composedly, "and father was angry with him." ¶ "What?" exclaimed Eileen. "When?" ¶ "This morning, before father went downtown." ¶ Both Selwyn and Lansing cut in coolly, dismissing the matter with a careless word or two; and coffee was served—cambric tea in Drina's case.
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4
adv
With calm impudence.
They walked in, not even wearing masks, and coolly robbed the bank of twelve thousand pounds.
Thesaurus
Etymology
From cool + -ly (adjectival suffix).