The quality or state of being deathy or resembling death; deathlike appearance or character.
From deathy (resembling death) + -ness suffix. Deathy itself comes from death + -y suffix (forming adjectives). The -ness suffix creates abstract nouns from adjectives.
English adjectives ending in -y (like 'deathy,' 'dusty,' 'cloudy') often sound informal or colloquial, so their -ness nouns are rarer—'deathiness' captures that eerie, death-like quality you might see in old paintings or gothic literature.
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