English version

crackpot

From Longman Dictionary of Contemporary Englishcrackpotcrack‧pot /ˈkrækpɒt $ -pɑːt/ noun [countable] informal  CRAZYsomeone who is slightly crazycrackpot adjective crackpot schemes
Examples from the Corpus
crackpotThough few volunteers were ready to migrate, not everyone thought Turner a crackpot.You get these crackpot ideas about helping people who come along to you with a mournful tale.
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