un·suc·cess·ful 
/ˌʌnsəkˈsɛsfəl/ adjective
/ˌʌnsəkˈsɛsfəl/ adjective [more unsuccessful; most unsuccessful] : not having or producing success : not successful
▪ The operation was unsuccessful. ▪ an unsuccessful musician ▪ His last novel was unsuccessful. ▪ an unsuccessful attempt
▪ The operation was unsuccessful. ▪ an unsuccessful musician ▪ His last novel was unsuccessful. ▪ an unsuccessful attempt
— un·suc·cess·ful·ly adverb
▪ They tried unsuccessfully to change his mind.
▪ They tried unsuccessfully to change his mind.
