That state of a man~s mind which is adequate to
reason and comes to a judgment upon ordinary subjects, like other rational men.
2. The law presumes that every person who has acquired his full age is
of sound mind, and consequently competent to make contracts and perform all his
civil duties; and he who asserts to the contrary must prove the affirmation of
his position by explicit evidence, and not by conjectural proof. 2 Hagg Eccl.
R. 434; 3 Addams~ R. 86; 8 Watts, R. 66; Ray, Med. Jur. §92; 3 Curt. Eccl.
R. 671. Vide Unsound mind.
Source: Bouviers Law Dictionary 1856 Edition