adjective, rash·er, rash·est.

acting or tending to act too hastily or without due consideration.
characterized by or showing too great haste or lack of consideration: rash promises.

Nearby words

  1. rascal,
  2. rascality,
  3. rascally,
  4. rascasse,
  5. rase,
  6. rash shirt,
  7. rasher,
  8. rashi,
  9. rashid,
  10. rashida

Origin of rash

1350–1400; Middle English; cognate with Dutch, German rasch quick, brisk, Old Norse rǫskr brave

Related formsrash·ly, adverbrash·ness, noun




an eruption or efflorescence on the skin.
a multitude of instances of something occurring more or less during the same period of time: a rash of robberies last month.

Origin of rash

1700–10; < French rache (obsolete), Old French rasche skin eruption, derivative of raschier to scratch, ultimately < Latin rādere to scratch

Related formsrash·like, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rash

British Dictionary definitions for rash




acting without due consideration or thought; impetuous
characterized by or resulting from excessive haste or impetuositya rash word
Derived Formsrashly, adverbrashness, noun

Word Origin for rash

C14: from Old High German rasc hurried, clever; related to Old Norse roskr brave


pathol any skin eruption
a series of unpleasant and unexpected occurrencesa rash of forest fires
Derived Formsrashlike, adjective

Word Origin for rash

C18: from Old French rasche, from raschier to scratch, from Latin rādere to scrape

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 rash
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for rash




A skin eruption.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.