Definition of unsuccessful adjective from the Oxford Advanced American Dictionary

  

unsuccessful

 adjective
adjective
NAmE//ˌʌnsəkˈsɛsfl//
 
 
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 not successful; not achieving what you wanted to His efforts to get a job proved unsuccessful. They were unsuccessful in meeting their objectives for the year. She made several unsuccessful attempts to see him. opposite successful
unsuccessfully
 
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NAmE//ˌʌnsəkˈsɛsfəli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: unsuccessful