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Definitions

of sound mind

[uhv sound mahynd] / əv ˈsaʊnd ˈmaɪnd /
ADJECTIVE
compos mentis
Synonyms
WEAK
all there balanced lucid mentally sound rational sound stable well-balanced
ADJECTIVE
sane
Synonyms
STRONGEST
balanced fair-minded healthy intelligent levelheaded logical lucid normal prudent rational sensible sober wise
WEAK
all there both oars in water commonsensical compos mentis discerning fit having all marbles in one's right mind judicious moderate oriented playing with full deck right right-minded sagacious sage sapient self-possessed sound steady together well
Antonyms
STRONGEST
foolish irrational stupid unbalanced unintelligent unrealistic unreasonable unwise
WEAK
crazy insane unsound unstable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

While she was of sound mind, she had physical ailments that kept her from walking very far — suggesting she didn’t leave on her own.

From Los Angeles Times • Feb. 3, 2026

In 2016, Michael sent a cease-and-desist letter to Saks’s management explaining that his mother wasn’t of sound mind and that Kwatra was abusing his position.

From The Wall Street Journal • Dec. 25, 2025

When she made her will she also included a document signed by her doctor stating she was of sound mind, etc., and specified that she didn’t want to leave anything to her sons.

From MarketWatch • Oct. 9, 2025

There’s no reason to doubt whether Hackman was of sound mind at that time.

From Salon • Jul. 30, 2025

He defined reliable evidence as one would in a court of law: more than one witness, and the witnesses must be of sound mind, not partial or prejudiced.

From "The Invention of Science" by David Wootton