1 adj Something that is reactive is able to react chemically with a lot of different substances.
Ozone is a highly reactive form of oxygen gas.
2 adj If someone is reactive, they behave in response to what happens to them, rather than deciding in advance how they want to behave.
usu v-link ADJ (Antonym: proactive)
I want our organization to be less reactive and more pro-active.
Translation English - Cobuild Collins Dictionary
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"