1.  unavailing
2.  fruitless
3.  vain
4.  infructuous
5.  rewardless

• 1. 徒劳的: vain | futile | furitless | fruitless
• 2. 徒劳的搜索: a wild goose chase | goose chase | a wild-goose chase
• 3. 你的企图是徒劳的: Your attempts are futile

更多释义

• 1.他知道抗议是徒劳的。
  He knew it was useless to protest.
  dict.yoduao.com
• 2.他想粉饰事实，但那是徒劳的。
  He tried to varnish over the facts, but it was useless.
  dict.yoduao.com
• 3.他祈祷，他哭泣，他悲伤，但都是徒劳的。
  He prayed, he wept, he sorrowed, but all in vain.
  dict.yoduao.com

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