Definition
"Of sound mind" means mentally competent and capable of making rational decisions. It's a common legal term used to describe someone who is not suffering from any mental illness or impairment that would affect their judgment. It is effectively synonymous with "compos mentis." Think of it as having a clear and coherent mental state. It implies the ability to understand the consequences of one's actions. For example, you have to be 'of sound mind' to enter a contract. π