reactive
US /riˈæk.tɪv/
UK /riˈæk.tɪv/
1.
showing a response to a stimulus
:
•
The patient's pupils were reactive to light.
•
The new material is highly reactive to heat.
2.
acting in response to a situation rather than creating or controlling it
:
•
Their approach to customer complaints is often reactive, not proactive.
•
A reactive government only acts after a crisis occurs.