Definitions: (1) founded on truth; strong; valid; reliable; sensible <sound advice>; (2) morally solid; honest; honorable; upright; virtuous; trustworthy <The Church prides itself on sound principles.>; (3) firm; safe; stable; secure <especially financially>; (4) thorough; complete; (5) whole; unimpaired; unhurt; unmutilated; not weak, diseased, or damaged; healthy
Saying: Mens sana in corpore sano (Latin): “a sound mind in a sound body”