How have courts treated the term "insanity" in the context of mental illness?

"Mental illness" and "insanity" are generally considered synonymous terms, and here the superior court properly so considered them. "Mental disease, Mental disorder, and Mental illness . . . are to be construed to include insanity, . . ." (44 C.J.S. Insane Persons 2, pp. 38-39, and see authority there collected.) And " ' "insanity" is a broad, comprehensive, and generic term, of ambiguous import, for all unsound and deranged conditions of the mind'. . . ." (Dribin v. Superior Court (1951) 37 Cal.2d 345, 352, 231 P.2d 809, 814.) We shall also treat the terms "mental illness" and "insanity" as synonymous, and for convenience use the word "insanity."