unavailing

adjective
🔊/ˌʌnəˈveɪlɪŋ/
🔊/ˌʌnəˈveɪlɪŋ/
(formal)
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  1. without success徒劳的;无成果的 synonym unsuccessful
    • Their efforts were unavailing.他们的努力都付诸东流。🔊🔊
    Topics Difficulty and failurec2