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: A sound mind in a sound body

Quote: The sound of a kiss is not so loud as that of a cannon, but its echo lasts a great deal longer. —  Oliver Wendell Holmes, Sr. (1809–1894) American polymath [six disciplines]