have a bad case of the simples

have a bad case of the simples

Rur. to be stupid. That boy has a bad case of the simples. He can't understand anything. She acts smart enough on the playground, but get her in the classroom and she has a bad case of the simples.
See also: bad, case, have, of, simple
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • go at like a boy killing snakes
  • stand there with bare face hanging out
  • if you've a mind to do
  • If it ain't chickens, it's feathers
  • fair out
  • have more than one string to fiddle
  • have hung up and salted
  • It'll be a long day in January
  • have just one oar in the water
  • stupehead