Deadness, n.
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.
Shades of meaning
Fernald lists deadness only as an antonym, under enthusiasm, sensibility.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given