Meaning : 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.
Example :
She began to recover from her numb unresponsiveness after the accident.
In an instant all the deadness and withdrawal were wiped away.
Synonyms : deadness
The quality of being responsive. Reacting quickly. As a quality of people, it involves responding with emotion to people and events.
responsiveness