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unsuccessful

[uhn-suh k-ses-fuh l] /ˌʌn səkˈsɛs fəl/
adjective
1.
not achieving or not attended with success:
an unsuccessful person; an unsuccessful venture.
Origin
1610-1620
1610-20; un-1 + successful
Related forms
unsuccessfully, adverb
unsuccessfulness, noun
Synonyms
hapless, unfortunate, foiled, baffled.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un successful

unsuccessful

/ˌʌnsəkˈsɛsfʊl/
adjective
1.
not having succeeded
Derived Forms
unsuccessfully, adverb
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
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Word Origin and History for un successful

unsuccessful

adj.

1610s, from un- (1) "not" + successful. Related: Unsuccessfully.

Online Etymology Dictionary, © 2010 Douglas Harper
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