Partial insanity
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
That wherein the mind is clouded and weakened, but not incapable of remembering, reasoning and judging. See 50 N. H. 369, 9 Am. Rep. 242.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Mental uDsoundness always existing, although only occasionally manifest; monomania. 3 Add. 79.
Defined under Partial in Black's Law Dictionary.