crack·pot

[krak-pot] Informal.
noun
1.
a person who is eccentric, unrealistic, or fanatical.
adjective
2.
eccentric; impractical; fanatical: crackpot ideas.

Origin:
1860–65; from the phrase cracked pot

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
crackpot (ˈkrækˌpɒt) [Click for IPA pronunciation guide]
 
n
1.  an eccentric person; crank
 
adj
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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00:10
Crackpot is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

crackpot
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.
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Example sentences
The line between crackpot and innovative is sometimes wiggly.
Whether you consider him a crackpot or not seems to hinge on how seriously you
  take his gold standard talk.
No way should the captain have been able to make a crackpot move by himself.
Otherwise the doctor dismisses you as a hypochondriac or crackpot, and quite
  rightly so.
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