futile
adj.无效的，无用的；没有出息的；琐碎的，无关紧要的；一场空
网络解释.琐细的；无用的；没有价值的；徒劳
adj.1.无益的;无效的释义下的同义词
bootless ineffective vain unsuccessful fruitless useless
双语例句
1. 1 . 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.
来自《简明英汉词典》