Etymology
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deadness (n.)

"condition or quality of being dead" (literally or figuratively), c. 1600, from dead (adj.) + -ness.

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Definitions of deadness

deadness (n.)
the quality of being unresponsive; not reacting; as a quality of people, it is marked by a failure to respond quickly or with emotion to people or events;
in an instant all the deadness and withdrawal were wiped away
Synonyms: unresponsiveness
deadness (n.)
the physical property of something that has lost its elasticity;
he objected to the deadness of the tennis balls
deadness (n.)
the inanimate property of something that has died;
From wordnet.princeton.edu