un·suc·cess·ful

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

Origin:
1610–20; un-1 + successful

un·suc·cess·ful·ly, adverb
un·suc·cess·ful·ness, noun


hapless, unfortunate, foiled, baffled.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unsuccessful (ˌʌnsəkˈsɛsfʊl) [Click for IPA pronunciation guide]
 
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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00:10
Unsuccessful is always a great word to know.
So is interrobang. Does it mean:
a gadget; dingus; thingumbob.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

unsuccessful
1617, from un- (1) "not" + successful.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
The fellow thought he was a lunatic at large and made an unsuccessful attempt
  to shut him into the taproom.
Attempts to reach the company for comment were unsuccessful.
There has never been an unsuccessful batch, yet no batch is ever identical to
  any other.
Attempts at resuscitating him by his personal physician were unsuccessful.
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