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Definitions of lunatic:

noun:   an insane person
noun:   a reckless impetuous irresponsible person
adjective:   insane and believed to be affected by the phases of the moon

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Alternative Terms
brainsick crazy daft demented disordered distraught dotty insane mad maniac mentally-ill moonstruck off touched unbalanced unsound wrong bonkers cracked daffy gaga loony bananas batty buggy cuckoo fruity loco nut screwy wacky crackers non-compos-mentis sane-insane absurd foolish harebrained idiotic imbecilic moronic nonsensical preposterous silly softheaded tomfool unearthly zany cockeyed loopy balmy dippy dopey jerky sappy ability-inability knowledge-ignorance crackpot eccentric crank loon ding-a-ling dingbat kook screwball weirdie weirdo wise-foolish mental-disorder-2 latin moon folklore lunar-effect symptom mood-disorder bipolar-disorder cyclothymia 1999 hypothesis electric-light psychiatric-hospital russian-language polish-language czech-language sleepwalking diana england wales mental-health-act european-convention-on-human-rights mental-hospital-2 national-health-service tabloid early-history-of-minnesota-golden-gophers-football marine-chronometer longitude lunar-distance-navigation astronomer-royal nevil-maskelyne lunar-society birmingham-alabama-amtrak-station

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