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Definition of unsuccessful - 3 dictionary results

un⋅suc⋅cess⋅ful

  [uhn-suhk-ses-fuhl]
Use unsuccessful in a Sentence
–adjective
not achieving or not attended with success: an unsuccessful person; an unsuccessful venture.
Origin:
1610–20; un- 1 + successful

Related forms:
un⋅suc⋅cess⋅ful⋅ly, adverb
un⋅suc⋅cess⋅ful⋅ness, noun

Synonyms:
hapless, unfortunate, foiled, baffled.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To unsuccessful
un·suc·cess·ful   (ŭn'sək-sěs'fəl)   
adj.  

  1. Having an unfavorable outcome: an unsuccessful venture.

  2. Failing to attain something desired or intended: an unsuccessful entrepreneur.

un'suc·cess'ful·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

unsuccessful 
1617, from un- (1) "not" + successful (see success).
Online Etymology Dictionary, © 2001 Douglas Harper
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