Etymology
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coolness (n.)

Old English colnesse "a moderate degree of cold, somewhat low temperature;" see cool (adj.) + -ness. Figurative sense of "absence of mental confusion or excitement" is from 1650s; that of "absence of warm affection" is from 1670s; that of "quiet, unabashed impudence" is by 1751.

updated on March 21, 2018

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Definitions of coolness from WordNet

coolness (n.)
calm and unruffled self-assurance;
he performed with all the coolness of a veteran
Synonyms: imperturbability / imperturbableness
coolness (n.)
the property of being moderately cold;
Synonyms: chilliness / nip
coolness (n.)
fearless self-possession in the face of danger;
Synonyms: nervelessness
coolness (n.)
a lack of affection or enthusiasm;
Synonyms: coldness / frigidity / frigidness / iciness / chilliness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near coolness

cool

coolant

cooler

coolie

coolly

coolness

coolth

coomb

coon

coonskin

coop