like nailing Jell-O to the wall

like nailing Jell-O to the wall

Incredibly difficult or impossible, such that it could be seen as foolish or futile to attempt. (Jell-O is a trademark for a brand of gelatin-based desserts that have a soft, gelatinous texture.) Trying to have a reasonable debate with her father is like nailing Jell-O to the wall. Getting the kids to behave after a big party is like nailing Jell-O to the wall.
See also: like, nail, wall
Farlex Dictionary of Idioms.
See also:
  • like trying to nail Jell-O to the wall
  • give (one) up as a bad job
  • give somebody/something up as a bad job
  • put a rope to the eye of a needle
  • bark up the wrong tree
  • bark up the wrong tree, to
  • cast stones against the wind
  • a losing game
  • roast snow in a furnace
  • pour water on a duck's back