Definify.com

Webster 1913 Edition

Noun.

The state of being destitute of life, vigor, spirit, activity, etc.; dullness; inertness; languor; coldness; vapidness; indifference;

as, the

deadness

of a limb, a body, or a tree; the

deadness

of an eye;

deadness

of the affections; the

deadness

of beer or cider;

deadness

to the world, and the like.

Noun.

ded'ness.

deadness ‎(usually uncountable, plural deadnesses)

The state of not being alive. Having the property of lifelessness, as if dead.
- 1840, John Wesley, The Works of the Reverend John Wesley, A.M, p.334
  O may it be my constant care to watch and pray; the neglect of which was the chief cause of my former deadness.
A lack of elasticity.
He complained that the deadness of the balls affected his game.
A lack of sparkle in a fizzy drink.
The deadness of the champagne made it undrinkable.
A lack of animation in a person.
The deadness of his expression told everything, without him having to speak.