Meanings
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1
noun
calm and unruffled self-assurance
They performed with all the coolness of veterans.
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2
noun
Moderate chilliness.
I know a place of all sweet coolnesses; / a little island, like an emerald, set / in the clear argent of a river, that is / Itself a shining net.
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3
noun
Calmness, confidence, or level-headedness.
De Coude was the personification of coolness—was he not the best shot in France?
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4
noun
Conflict or hostility or an instance of such that stands in contrast to expected friendliness or interest.
In the midst of enemies, Irish and English, Court treacheries and coolnesses, Strafford depended solely upon Laud, and no one other support.
Thesaurus
Etymology
From Middle English colnes, colnesse, from Old English cōlnes, cœ̄lnes, cēlnes (“coolness; cool air, breeze”), from Proto-West Germanic *kōlinassī, equivalent to cool + -ness. Cognate with Middle High German kuolnisse, küelnisse (“cooling, coolness”).