Definition of "crackpot" [crackpot]

• An eccentric person, especially one with bizarre ideas. (noun)
• Foolish; harebrained: a crackpot notion. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Referring to Republican Sarah Palin and what he characterizes as the "crackpot parade," he called the situation kind of "scary.""
• "Somewhere in Saudi Arabia, another crackpot is preaching the exact opposite message."
• "Re: Calling Tolstoy a crackpot is not only nonsense, it displays moral obtusity."