crackbrain

He will probably want to take charge, but if he's not a crackbrain, it won't matter.

"At least that mother lorn old crackbrain won't be around to see you off."

You basically called him a superannuated crackbrain in your column, remember?

That lecherous old crackbrain might have forgotten her existence for the moment, but he would remember the next time he saw her.

Kevin's query was brief: "Who's the crackbrain?"

I'm also called Brother Crackbrain, and also The Hunchback.

As noted in Webster's New Collegiate Dictionary, the terms "crackpot", "crackbrain" and "cracked" are synonymous, and suggest a metaphorically "broken" head.

To be sitting here, trying to get up the nerve for another attempt at those deadly waters, and then to have some crackbrain come along and- "You're deluding yourself, Miss Matheson," the man went on coolly.

And this issue he had been hard put to it to find a couple of intelligent letters for the correspondence page; sometimes it seemed that every crackbrain in north-east Norfolk read the PANUP newsletter but that no one else did.