reactive
adj. B2 Upper Intermediate US //ɹiˈæktɪv// UK //ɹɪˈæktɪv// re·ac·tive
adj. responding to something that happens, rather than causing it yourself. You are reactive when you wait for a problem before you act.
adj. responding to an external stimulus or event rather than initiating action. Often used to describe a passive approach to management or behavior.
She is reactive instead of proactive.
The team was reactive to the crisis rather than prepared.
A reactive strategy often leads to higher costs because decisions are made under pressure rather than through careful planning.
From react + -ive.
Usage
Often contrasted with 'proactive'.