reactive

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Adjective reactive has 2 senses

reactive - participating readily in reactions; "sodium is a reactive metal"; "free radicals are very reactive"
Antonyms: unreactive, inactive, inert, indifferent, neutral, stable, noble
reactive - tending to react to a stimulus; "the skin of the geriatric is less reactive than that of younger persons"- Louis Tuft
Antonym: insensitive (indirect, via sensitive)