of no use

n. 无用(无效)

例句与用法：

It is of no use boasting of being rich on a desert island.

在无人岛上夸耀富有也是白费力气。

It is of no use to talk to him; he is as deaf as a post.

跟他说话毫无用处，因为他一点也听见。

Lacking worth; of no use or value.

无价值的不值得的; 无用的或无价值的

详细释义：

没用的

It is of no use talking with him.

跟他说没用。