Unsound | Mean of unsound in English Dictionary

/ˌʌnˈsaʊnd/

• not based on truth or logic
1. unsound [=faulty] arguments
2. unsound business practices
• poorly built or in bad condition
1. an unsound [=unsafe] building
2. The roof is structurally unsound.
• mentally ill
1. He was found to be of unsound mind when he committed the murder.