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Definition of lunatic:
Synonyms:
meshuga, dwarf, loco, unhinged, ding-a-ling, barmy, haywire, unearthly, loon, hunchback, gaga, nuts, wacko, unwise, buggy, madwoman, idiotic, loony, loony tunes, sane, foolish, wise, swashbuckler, harum-scarum, bedlam, loopy, absurd, bonkers, risky, preposterous, cripple, fruity, mentally ill, moronic, jerky, madman, half-witted, softheaded, dippy, cabbage, unsafe, witless, silly, nutjob, imbecile, damaging, sappy, dotty, nonsensical, cracked, hazardous, bananas, weak-minded, zany, fool, wud, disordered, cockeyed, brainsick, humpback, bughouse, backward, weirdie, screwy, cranky, screwball, space cadet, fire-eater, crackers, madcap, off, lunkheaded, dingbat, wacky, asinine, featherheaded, imbecilic, crazed, bubbleheaded, ruinous, fatuous, daft, simpleminded, oddball, knowledge, scatty, tomfool, touched, hothead, ability, harebrained, weirdo, unsound, injurious, headcase, crackbrained, disastrous, insane, cuckoo, maniac, dangerous, non compos mentis, eccentric, mental, distraught, harmful, bats, senseless, moonstruck, brainless, balmy, perilous, daffy, certifiable, half-baked, daredevil, wrong, inept, oddity, dopey.
- foolish (part of speech: adjective)
- lunatic (part of speech: noun)
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insane (part of speech: adjective)
- demented,
- maniacal,
- irrational,
- feverish,
- babbling,
- kooky,
- hysterical,
- deranged,
- crack-brained,
- brain-sick,
- psychotic,
- nutty,
- mad,
- unbalanced,
- berserk,
- crazy,
- frenzied,
- delirious,
- neurotic,
- schizoid,
- psycho,
- blithering,
- batty,
- insane