[krak-pot] Informal.
a person who is eccentric, unrealistic, or fanatical.
eccentric; impractical; fanatical: crackpot ideas.

1860–65; from the phrase cracked pot Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crackpot (ˈkrækˌpɒt)
1.  an eccentric person; crank
2.  (usually prenominal) eccentric; crazy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1883, probably from pot in a slang sense of "head." Cf. crack-brain "crazy fellow" (c.1570).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

crackpot definition

  1. n.
    a fake; a person with strange or crazy plans. : Some crackpot called to tell us that the sky is falling in.
  2. mod.
    having to do with crazy things, mainly ideas. : We need a crackpot idea around here just so we'll have something to compare your ideas to.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Today, the science that underpinned those views seems crackpot.
No way should the captain have been able to make a crackpot move by himself.
Storms is not an antiestablishment pseudoscientist pursuing a crackpot theory.
Whether you consider him a crackpot or not seems to hinge on how seriously you
  take his gold standard talk.
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