Roget's Thesaurus: Entry 504 (Madman)

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#504. Madman. -- N. madman, lunatic, maniac, bedlamite[obs], candidate for Bedlam, raver[obs], madcap, crazy; energumen[obs]; automaniac[obs], monomaniac, dipsomaniac, kleptomaniac; hypochondriac &c. (low spirits); crank, Tom o'Bedlam.

dreamer &c. 515; rhapsodist, seer, highflier[obs], enthusiast, fanatic, fanatico[Sp]; exalte[French]; knight errant, Don Quixote.

idiot &c. 501.