unprofitable;useless;no good;burn daylight;futility ;

You must obey the rule. It is useless for you to kick against the pricks.
你必须遵守规定, 对抗对你是无益的.
来源:《简明英汉词典》Speculation as to the desirability of this process is an unprofitable pastime.
猜测这一进程有何可取之处是无益之举.
来源:词典精选例句This is an unprofitable discussion. Our standpoints are too different.
这是一种无益的讨论. 我们的立场太不一样了.
来源:词典精选例句Unprofitable eloquence is like the cypress, which is great and tall, but bears no fruit.
无益的雄辩犹如柏树, 虽然高大但不结果.
来源:《简明英汉词典》It's no use giving him advice. He won't take any notice of it. You might as well save your breath.
劝他也是无益, 他是不会理睬的. 你也得省点力气别开口.
来源:《简明英汉词典》
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