usage: 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; "she began to recover from her numb unresponsiveness after the accident"; "in an instant all the deadness and withdrawal were wiped away"
2. deadness, inelasticity
usage: the physical property of something that has lost its elasticity; "he objected to the deadness of the tennis balls"
3. deadness, inanimateness, lifelessness
usage: the inanimate property of something that has died