Etymology

coolness

cool·ness
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Today it means: Moderate chilliness. Full definition →

Middle English colnes ← Old English cōlnes ← Proto-West Germanic *kōlinassī
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The story

  1. Proto-West Germanic · inherited from*kōlinassī
  2. Old English · inherited fromcōlnes
  3. Middle English · inherited fromcolnes
  4. English todaycoolness

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”).

Etymology from Wiktionary, CC BY-SA 4.0.