sound mind en · ADP
Etymology
By surface analysis, of (genitive proposition) + sound (“solid, stable, sturdy”) + mind (“reason”).
Meanings
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(idiomatic, usually, with-negation) sane, rational, maintaining one's mental capability to act reasonably.
A sound mind means as good a judgement as that mind is capable of from the nature of its organization.
1894, A. H. P. Leuf, M. D., “The status of physical education.”, in Mind and Body, volume 1, Freidenker Publishing Company, page 9: