reactive

/riˈæktɪv/
adjective
  1. Tending to react to things that happen rather than acting first to prevent or cause them.
    • Her reactive approach to problems means she only fixes things after they break.
    • The company was criticized for being too reactive instead of planning ahead.
    • A reactive driver might slam on the brakes instead of anticipating the stop.
  2. Relating to a chemical substance that reacts easily with other substances.
    • Sodium is a highly reactive metal that can explode when it touches water.
    • Some reactive chemicals must be stored in special containers to prevent accidents.
    • The lab technician handled the reactive gas with extreme caution.
  3. Relating to the body's response to a stimulus, such as an allergy or immune reaction.
    • Doctors measured the reactive antibodies in her blood after the vaccine.
    • The patient's reactive airway disease causes coughing when she exercises.
    • A reactive skin test showed that he is allergic to cat dander.
Synonyms
Antonyms
What does "reactive" mean? | whatsthatwordmean | whatsthatwordmean