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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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 for unsuccessfully
Their marriage was not a happy one, and bill unsuccessfully attempted to divorce louisa.
The government has unsuccessfully attempted several eradication programs.
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