profitless
[ˈprɑ:fɪtləs]
adj.
无益的;
无用的;
无利的;
无利可图的;
例句:
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Revising the procedure was an entirely profitless exercise.
对程序进行修改是徒劳无功的.
来自《简明英汉词典》
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It is profitless to continue arguing.
继续争论是无益的.
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Let us have no part in profitless quarrels.
我们不要卷入毫无意义的争吵之中.