[ ree-ak-tiv ]
/ riˈæk tɪv /
tending to react.
pertaining to or characterized by reaction.
Electricity. pertaining to or characterized by reactance.
re·ac·tive·ly, adverbre·ac·tive·ness, nounan·ti·re·ac·tive, adjectivehy·per·re·ac·tive, adjective
non·re·ac·tive, adjectiveo·ver·re·ac·tive, adjectiveun·re·ac·tive, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for unreactive (1 of 2)
/ (ˌʌnrɪˈæktɪv) /
(of a substance) not readily partaking in chemical reactions
British Dictionary definitions for unreactive (2 of 2)
/ (rɪˈæktɪv) /
readily partaking in chemical reactionssodium is a reactive metal; free radicals are very reactive
of, concerned with, or having a reactance
responsive to stimulus
(of mental illnesses) precipitated by an external causereactive depression
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 unreactive
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for unreactive
[ rē-ăk′tĭv ]
Tending to be responsive or to react to a stimulus.
Characterized by reaction.
Tending to participate readily in chemical reactions.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.