"I believe there are more instances of the abridgment of the freedom of the people by gradual and silent encroachments of those in power than by violent and sudden usurpations."-James Madison, 1788
Search The Library's Lexicon
These words have been adopted in several statutes, and sometimes indiscriminately used to signify, not only lunacy, which is periodical madness, but also a permanent adventitious insanity as distinguished from idiocy.
The term unsound mind seems to have been used in those statutes in the same sense as insane; but they have been said to import that the party was in some such state as was contradistinguished from idiocy and from lunacy, and yet such is made him a proper subject of a commission to inquire of idiocy and lunacy.