1 [rash]
adjective, rasher, rashest.
acting or tending to act too hastily or without due consideration.
characterized by or showing too great haste or lack of consideration: rash promises.

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

rashly, adverb
rashness, noun

1. hasty, impetuous, reckless, venturous, incautious, precipitate, indiscreet, foolhardy.

1. cautious.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rash1 (ræʃ)
1.  acting without due consideration or thought; impetuous
2.  characterized by or resulting from excessive haste or impetuosity: a rash word
[C14: from Old High German rasc hurried, clever; related to Old Norse roskr brave]

rash2 (ræʃ)
1.  pathol any skin eruption
2.  a series of unpleasant and unexpected occurrences: a rash of forest fires
[C18: from Old French rasche, from raschier to scratch, from Latin rādere to scrape]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "nimble, quick, vigorous," a Scottish and northern word, perhaps from O.E. -ræsc (cf. ligræsc "flash of lightning"), from P.Gmc. *raskuz (cf. M.L.G. rasch, M.Du. rasc "quick, swift," Ger. rasch "quick, fast"). Related to O.E. horsc "quick-witted." Sense of "reckless, impetuous, heedless
of consequences" is attested from 1509.

"red spots on skin," 1709, perhaps from Fr. rache "a sore," from O.Fr. rache "ringworm," from V.L. *rasicare "to scrape" (cf. O.Prov. rascar, Sp. rascar "to scrape, scratch," It. raschina "itch"), from L. rasus "scraped," pp. of radere "to scrape" (see raze). The connecting
notion is of itching. Sense of "any sudden outbreak or proliferation" first recorded 1820.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

rash (rāsh)
A skin eruption.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Her former colleagues felt that she had rashly sacrificed her intellect for her
  family and motherhood.
The candidates rashly pulled their observers when they declared fraud.
Too rashly charged the troops of error, and remain as trophies unto the enemies
  of truth.
To the intelligent, nature converts itself into a vast promise, and will not be
  rashly explained.
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