dumbo

[duhm-boh]Slang.
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adjective
  1. stupid or foolish: What a dumbo idea!

Origin of dumbo

probably earlier than 1955–60; dumb + -o
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British Dictionary definitions for dumbo

dumbo

noun plural -bos
  1. slang a slow-witted unintelligent person

Word Origin for dumbo

C20: after the flying elephant in Dumbo, the Walt Disney cartoon released in 1941
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012