| Noun | 1. | responsiveness - responsive to stimulation Synonyms: reactivity |
| 2. | responsiveness - the quality of being responsive; reacting quickly; as a quality of people, it involves responding with emotion to people and events Antonyms: unresponsiveness - 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 |