The quality or state of being clammy; an unpleasant damp and sticky feeling.
From 'clammy' plus the noun-forming suffix '-ness,' which creates abstract nouns representing qualities or states. This is a standard English word formation pattern.
Clamminess triggers genuine disgust in humans—our brains are wired to find excessive moisture on skin disturbing because in nature, it often signals illness or decay, making this a primal instinctual reaction.
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