folie

Of the two terms (folie circulaire and manic-depressive insanity) the latter is the more correct.

Some of them went into the Folie Wood nearby and met seven German officers strolling about the glades, as though no war was on.

Dr. Johnson, who was a sufferer from folie du doute, had to touch every post he passed.

Its owners head fell, severed by the guillotine, and his folie became national property.