reactive
adjectiveUK /riˈæk.tɪv/
US /riˈæk.tɪv/
Acting quickly because of something that happens.
The reactive dog barked at every passing car.
RELATED WORDS
OTHER MEANINGS
2. Happening as a result of something else rather than starting on its own.
The rash was a reactive response to the new soap.
3. In chemistry, able to combine easily with other substances.
Sodium is a highly reactive metal.
4. Showing a tendency to respond to problems only after they occur.
Their reactive approach meant they fixed issues only after customers complained.