crackpot
crackpot {n.}, {attrib. adj.}, {informal}
1. {n.}
An eccentric person with ideas that don't make sense to most other people.
Don't believe what Uncle Noam tells you — he is a crackpot.
2. {attrib. adj.}
That's a crackpot idea.
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Source: A Dictionary of American Idioms
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