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reactive

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Adjective reactive has 2 senses
  1. reactive - participating readily in reactions; "sodium is a reactive metal"; "free radicals are very reactive"
    Antonyms:
    unreactive, inactive, inert, indifferent, neutral, stable, noble
  2. 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)
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