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[krak-pot] /ˈkrækˌpɒt/ Informal.

a person who is eccentric, unrealistic, or fanatical.
eccentric; impractical; fanatical:
crackpot ideas.
an eccentric person; crank
(usually prenominal) eccentric; crazy

“mentally unbalanced person,” by 1900, probably from crack + pot (n.1) in a slang sense of “head.” Cf. crack-brain “crazy fellow” (late 16c.). Earlier it was used in a slang sense “a small-time big-shot” (1883), and by medical doctors in reference to a “metallic chinking sometimes heard when percussion is made over a cavity which communicates with a bronchus.”


: my colleague’s crackpot notions


A crazy idiot; an addled fool; eccentric: He’s a crackpot about flying saucers (1883+)


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