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Definition of delirium : 1. A state in which the thoughts, expressions, and actions are wild, irregular, and incoherent; mental aberration; a roving or wandering of the mind, - usually dependent on a fever or some other disease, and so distinguished from mania, or madness.
2. Strong excitement; wild enthusiasm; madness.

Synonyms:

furiousness, rage, violence, cult, hysterical neurosis, study at hysteria, craze, fad, alienation, vehemence, fever, ferocity, furor, aberration, fierceness, fury, wildness, excitement, monomania, furore

feverishness, craziness, kookiness, insanity, dementia, brain-sickness, madness, hysteria, mania, neurosis, nuttiness, psychosis, derangement, hallucination, frenzy, battiness, lunacy

Usage examples:

• Perhaps it was all part of delirium. - "Master of the Moondog", Stanley Mullen.
• So the day passed and then, Darby's delirium still continuing, she made out to get to a neighbor's to ask help. - "The Burial of the Guns", Thomas Nelson Page.
• We thought it was one of our friends running about in the delirium of fever, when in rushed Lieutenant Moriarty with an open letter in his hand of a very official appearance. - "Hurricane Hurry", W.H.G. Kingston.