The quality or state of resembling death; the characteristic of appearing dead or lifeless.
Derived from 'deathlike' plus the suffix '-ness' (Old English origin), which creates abstract nouns describing qualities. This follows the standard English pattern of converting adjectives into nouns.
The suffix '-ness' is one of English's most productive word-building tools—you can add it to almost any adjective to turn it into a noun about that quality, which is why 'deathlikeness' feels natural even if it's rare.
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