Synonyms of 'reactive'
I want our organization to be less reactive and more pro-active.
Ozone is a highly reactive form of oxygen gas.
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If you describe someone as apathetic, you are criticizing them because they do not seem to be interested in or enthusiastic about doing anything.
Many people feel apathetic about the candidates in both parties.
Someone or something that is inactive is not doing anything or is not working.
He certainly was not politically inactive.
Thesaurus for reactive from the Collins English Thesaurus
Something that is reactive is able to react chemically with a lot of different substances.