If a person's activities or judgment are unsound, they are not good enough, acceptable, or able to be trusted.

unsound accounting practices 不规范的会计行为

unsound police evidence 不确凿的警方证据

If a building or other structure is unsound, it is in bad condition and likely to fall down or fail.

The bridge is one of several said to be structurally unsound. 这座桥是据说结构上有问题的几座桥梁之一。

Synonyms: shaky (WEAK)unstable