Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
to react with less emotion, force, or intensity than is appropriate or expected
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
intransitive verb un·der·re·act·ed, un·der·re·act·ing, un·der·re·acts
To react with insufficient enthusiasm, force, or emphasis.
- unˌder·re·acˈtion noun