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réactif

/ʁe.ak.tif/

noun, masculine/ʁe.ak.tif/plural: réactifs

reagent

From the stem of réaction + -if.

adjective/ʁe.ak.tif/

reactive; responsive, quick to respond, who replies fast; reactive (not proactive, not acting preventively, dealing with problems only after the fact, tackling issues only after they've occurred)

Near-synonym: prompt

Synonyms: prompt

Antonyms: proactif

From the stem of réaction + -if.