I had an intuitive conviction that there was something unsound in him.

直觉使我确信他有问题。

That bridge looks unsound to me.

以我看那桥安全。

He escaped a prison sentence by reason of unsound mind at the time the crime was committed.

他以犯罪时精神正常为由逃过了监禁刑罚。

Don’t listen to unsound advice.

别去听无根据劝告。