crackpot

[ krak-pot ]
/ ˈkrækˌpɒt /
Informal.

noun

a person who is eccentric, unrealistic, or fanatical.

adjective

eccentric; impractical; fanatical: crackpot ideas.

Origin of crackpot

First recorded in 1860–65; from the phrase cracked pot
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for crackpot

crackpot

/ (ˈkrækˌpɒt) informal /

noun

an eccentric person; crank

adjective

(usually prenominal) eccentric; crazy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for crackpot

crackpot


n.

"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."

Online Etymology Dictionary, © 2010 Douglas Harper