I've heard enough of your crackbrained schemes.One more crackbrained idea and you're fired.
crackbrained
Wacky or crazy. There's a guy on our corner who shouts about the end of the world; I think he's a little crackbrained.Oh please, that'll never work—it's a crackbrained idea.
crackbrained
mod. stupid; ridiculous. I’ve heard enough of your crackbrained schemes.