illusional

Updated: June 28, 2025

The existence of such species of insanity is not difficult to discover. The second and more common form of insanity, and that which it is often difficult to discover and pronounce upon with certainty, is that which I have called delusional or illusional.

Charles Coppens - Moral Principles and Medical Practice: The Basis of Medical Jurisprudence

When there is an abnormally low grade of the reasoning power, it is styled imbecility. The failure or decay of reason in old age is called dotage. The second kind of insanity is called illusional or delusional. In it the intellect is not impotent; on the contrary, it is often unusually active; but its action is abnormal, its conclusions are false.

Charles Coppens - Moral Principles and Medical Practice: The Basis of Medical Jurisprudence