with a loose screw

with a loose screw

Having or characterized by silliness, eccentricity, craziness, or mental instability. There's some guy with a loose screw standing on the corner yelling obscenities at passersby. I have this strange fear that I'm going to turn into a lonely old bachelor with a loose screw when I get old.
See also: loose, screw
Farlex Dictionary of Idioms.
See also:
  • with a screw loose
  • loo
  • have got a loose screw
  • have got a screw loose
  • kangaroo
  • a kangaroo loose in the top paddock
  • paddock
  • screw loose, to have a
  • have a loose screw
  • have a screw loose