crackpot

[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

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World English Dictionary
crackpot (ˈkrækˌpɒt)
 
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
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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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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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