[ rash ]
/ ræʃ /
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See synonyms for: rash / rasher / rashly / rashness on Thesaurus.com

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.
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Origin of rash

First recorded in 1350–1400; Middle English; cognate with Dutch, German rasch “quick, brisk,” Old Norse rǫskr “brave”


rash·ly, adverbrash·ness, noun

Other definitions for rash (2 of 2)

[ rash ]
/ ræʃ /

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


rashlike, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022


What does rash mean?

Rash describes acting too quickly and without proper planning, as in James was rash when he decided to quit his job after just one hard day.

Rash also describes a great haste or a lack of consideration, such as Sahad avoided making rash decisions by doing a lot of research first. 

A rash is a skin condition, such as bumps or a red area, like you might get if you touch poison ivy.

A rash is also several instances of something that occur at the same or nearly the same time, such as a rash of snowstorms over a week or a rash of electronic sales during the winter holidays.

Example: He always jumps head first into rash decisions, but sometimes it works out.

Where does rash come from?

The first records of the term rash meaning “hasty” come from the 1300s. It is related to the Old Norse rǫskr, meaning “brave.” The first records of the term rash meaning “skin outbreak” come from the 1700s. It ultimately comes from the Latin rādere, meaning “to scratch.”

Normally, rashness is not a desired trait, as making decisions quickly without thinking about them enough can often lead to negative results. For example, when someone makes a promise they cannot keep, that is a rash promise or when they oversell their skill for a task, it is a rash commitment.

When referring to a skin condition, a rash can come in many different forms and can come from a variety of conditions. A heat rash can be the result of sweat glands becoming inflamed, usually causing itchiness or discomfort. You might also get a rash when you eat something you’re allergic to or when you touch something that commonly causes a reaction in humans, like poison sumac and poison oak.

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What are some other forms related to rash?

  • rashly (adverb)
  • rashness (noun)
  • rashlike (adjective)

What are some synonyms for rash?

What are some words that share a root or word element with rash

What are some words that often get used in discussing rash?

How is rash used in real life?

Rash, relating to skin, is usually used in a medical context, while rash, meaning “foolish” is used more commonly to describe someone else’s actions..

Try using rash!

Which of the following is NOT a synonym for rash?

A. foolhardy
B. cautious
C. reckless
D. daring

How to use rash in a sentence

British Dictionary definitions for rash (1 of 2)

/ (ræʃ) /

acting without due consideration or thought; impetuous
characterized by or resulting from excessive haste or impetuositya rash word

Derived forms of rash

rashly, adverbrashness, noun

Word Origin for rash

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

British Dictionary definitions for rash (2 of 2)

/ (ræʃ) /

pathol any skin eruption
a series of unpleasant and unexpected occurrencesa rash of forest fires

Derived forms of rash

rashlike, 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

Medical definitions for rash

[ răsh ]

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