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See more synonyms for reactive on Thesaurus.com
  1. tending to react.
  2. pertaining to or characterized by reaction.
  3. Electricity. pertaining to or characterized by reactance.
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Origin of reactive

First recorded in 1705–15; react + -ive
Related formsre·ac·tive·ly, adverbre·ac·tive·ness, nounan·ti·re·ac·tive, adjectivehy·per·re·ac·tive, adjectivenon·re·ac·tive, adjectiveo·ver·re·ac·tive, adjectiveun·re·ac·tive, adjective
Can be confusedproactive reactionary reactive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for nonreactive

insusceptible, asleep, dead, insensible, senseless, unfeeling, benumbed, anesthetized, nonreactive, impassible, impassive, unimpressionable

Examples from the Web for nonreactive

Contemporary Examples of nonreactive

British Dictionary definitions for nonreactive


  1. readily partaking in chemical reactionssodium is a reactive metal; free radicals are very reactive
  2. of, concerned with, or having a reactance
  3. responsive to stimulus
  4. (of mental illnesses) precipitated by an external causereactive depression
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Derived Formsreactively, adverbreactivity (ˌriːækˈtɪvɪtɪ) or reactiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for nonreactive



1712, from react + -ive. Related: Reactively; reactiveness; reactivity.

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Online Etymology Dictionary, © 2010 Douglas Harper

nonreactive in Medicine


  1. Tending to be responsive or to react to a stimulus.
  2. Characterized by reaction.
  3. Tending to participate readily in chemical reactions.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.