1.That bridge looks unsound to me.

1.以桥不安全。

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

2.直觉使确信他有问题。

3.Don’t listen to unsound advice.

3.别去听根据的劝告。

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

4.他以犯罪时精神不正常为由监禁刑罚。