/ʌnˈsaʊndnəs/ – noun
Definition: 1. sự không có căn cứ;
2. sự hư hỏng, sự không tốt;
3. sự không bình thường, sự rối loạn tâm thần;
4. sự mất khả năng chi trả, sự mất khả năng thanh toán.
A more thorough explanation: In legal terms, “unsoundness” refers to a condition or defect that impairs the value, usefulness, or safety of something, such as a product, property, or contract. It can also refer to a mental or physical condition that renders a person incapable of making sound decisions or judgments.
Example: The court found the contract to be unenforceable due to the unsoundness of the plaintiff’s mental capacity at the time of signing.