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reactive (adj.)

1712, "repercussive, echoing," a sense now obsolete, from react + -ive. By 1822 as "caused by a reaction;" 1888 as "susceptible to (chemical) reaction." Related: Reactively; reactiveness; reactivity.

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Definitions of reactive from WordNet

reactive (adj.)
participating readily in reactions;
free radicals are very reactive
sodium is a reactive metal
reactive (adj.)
reacting to a stimulus;
the skin of old persons is less reactive than that of younger persons
Synonyms: responsive
From wordnet.princeton.edu