English version

unavailing

From Longman Dictionary of Contemporary Englishunavailingun‧a‧vail‧ing /ˌʌnəˈveɪlɪŋ◂/ adjective literary  FAILnot successful or effective syn unsuccessful unavailing efforts to make her happy
Examples from the Corpus
unavailingA law protecting the nesting birds was passed in 1621 which, to judge from its results, was unavailing.Attempts to reach him by telephone were likewise unavailing.Purely national solutions to problems of corporate control are likely, therefore, to be unavailing.unavailing effortsAnd at least you will not have worn yourself out with unavailing efforts.
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