adj.无益的,无用的,无利的,无利可图的
Revising the procedure was an entirely profitless exercise.
对程序进行修改是徒劳无功的.
It is profitless to continue arguing.
继续争论是无益的.
Let us have no part in profitless quarrels.
我们不要卷入毫无意义的争吵之中.