unsuccessful

[uhn-suhk-ses-fuhl]
adjective
not achieving or not attended with success: an unsuccessful person; an unsuccessful venture.

Origin:
1610–20; un-1 + successful

unsuccessfully, adverb
unsuccessfulness, noun


hapless, unfortunate, foiled, baffled.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unsuccessful (ˌʌnsəkˈsɛsfʊl)
 
adj
not having succeeded
 
unsuccessfully
 
adv

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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Etymonline
Word Origin & History

unsuccessful
1617, from un- (1) "not" + successful.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The empty-handed males were mostly unsuccessful at mating.
More than unsuccessful models, there are unsuccessful mathematicians.
In any case even if true they only did it once so it obviously was unsuccessful.
Attempts at resuscitating him by his personal physician were unsuccessful.
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