brained

addlebrained

Confused, bewildered, or disoriented. This cold medicine has left me totally addlebrained—I just wrote down that 2 + 2 = 5.

bird-brained

Describing someone who lacks intelligence or makes stupid decisions. You're so bird-brained. I can't believe you got stranded on the highway because you didn't put enough gas in your car!

brain (someone)

To strike or assault someone violently and severely, typically on the head. He warned me that he was going to brain me if I didn't stop insulting him. The lump on my head is from when a box fell off a shelf and brained me yesterday.
See also: brain

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.
See also: crackbrain

fuck-brained

rude slang Stupid or foolish. Usually used before a noun. Oh, don't listen to anything that fuck-brained idiot has to say! I really don't want to hear another one of your fuck-brained ideas.

lamebrained

Utterly foolish or poorly thought out. He's always got some lamebrained scheme to get rich.
See also: lamebrain

pea-brained

Particularly stupid, foolish, or narrow-minded. The town hall meeting was hijacked by a few pea-brained morons trying to protest the new highway development. Don't let Tom's comments get you down—he's just a pea-brained jerk who puts other people down to make himself feel smart.
Farlex Dictionary of Idioms.

crackbrained

mod. stupid; ridiculous. I’ve heard enough of your crackbrained schemes.
See also: crackbrain

fuck-brained

1. mod. stupid; mindless. (Taboo. Usually objectionable.) What a stupid, fuck-brained idea!
2. mod. obsessed with sex. (Taboo. Usually objectionable.) All he thinks about is dames. He is totally fuck-brained.

lamebrained

verb
See lamebrain
See also: lamebrain
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • addlebrained
  • addle
  • (one) doesn't know which way is up or down
  • headfucker
  • go potty
  • be out of it
  • be/feel out of it/things
  • punch drunk
  • punch-drunk
  • punchy