futile
adj. 徒劳的，无用的；不重要的；没有出息的
例句
It would be futile to protest.
抗议也无用。
《牛津词典》
Their costly and futile attempt to subjugate the Afghans lasted just 10 years.
他们想征服阿富汗人的意图耗费大量金钱而且无效，只维持了十年的时间。
《柯林斯英汉双解大词典》
Like many in Russia, she blamed the country's failings on futile attempts to catch up with the West.
像在俄罗斯的许多人一样，她把这个国家的错误归咎于想赶上西方的徒劳。
