The quality or state of being deathly; a pale, ghostlike, or lifeless appearance or characteristic.
From 'deathly' (Old English deathlic, meaning 'subject to death') plus the suffix '-ness', which forms abstract nouns. The word evolved to describe the aesthetic or emotional quality of resembling death itself.
This word captures something that visual artists have always tried to convey—that eerie, draining-of-life feeling you get from a painting or person. It's the noun form that lets us talk about that quality as a *thing* rather than just describing something as 'deathly.'
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