Definition of "of sound mind" []

• Of sound mind, memory, and understanding; in law, competent to go to trial (adjective)

WordNet. Princeton University. 2010.

• "I, Mary Elizabeth Carson, being of sound mind and sound body, do hereby declare that this is my last will and testament, thereby rendering null and void any such testaments previously made by me."
• "Movie Deenie is of sound mind when she falls in love with the handsome and charming Bud."
• "The will began: “I, Dorothy Elizabeth Ruskin, being of sound mind and body,” then went on to state simply that the entirety of her estate was to go to support the archaeological effort in Palestine, with specific names and locations given."