reactive - definition and synonyms

adjective 

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/riˈæktɪv/
  1. 1
    reacting to things that happen, rather than making things happen yourself

    We take a proactive rather than a reactive approach.

  2. 2
    chemistry a reactive substance experiences a chemical reaction when it is mixed with another substance

derived word

reactivity

 

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/ˌriːækˈtɪvəti/
noun [uncountable]