Plural of deadness; multiple instances or forms of being dead, lifeless, or dull.
From 'deadness' (state of being dead or dull) pluralized with '-es' (standard English plural suffix for words ending in '-s'). The plural allows discussion of different types or instances of deadness.
When you pluralize an abstract noun like 'deadnesses,' you're treating different instances or kinds of lifelessness as countable—it's a subtle shift that lets writers distinguish between the deadness of winter and the deadness of a room, as separate phenomena.
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