futile
[ˈfju:tl]
adj.
无效的，无用的;
没有出息的;
琐碎的，无关紧要的;
一场空;
例句:
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Without microscopes and other modern equipment, attempts to teach science were futile.
没有显微镜及其他现代化的设备, 想教授自然科学是不会有成果的.
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They were killed, to the last man, in a futile attack.
因为进攻失败,他们全部被杀, 无一幸免.
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Their efforts to revive him were futile.
他们对他抢救无效.
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Repining, wrote Newhall, is a futile activity.
来自WSJ
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Maybe what we're doing at Noma is futile.
来自WSJ
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He is squandering his talent on a futile task.
来自THETIMES