It's hare-brained. Someone's got the brains of a rabbit.
Big Brained (or smart)
The Brady Bunch - 1969 The Hair-Brained Scheme 5-22 is rated/received certificates of: Australia:G
peanut butter is good
Big Brained (or smart)
Dumb, scatter brained, slow.
It means stupid..
1. Perhaps they are so hair brained. 2. They always like to split hairs.
batameez
someone who is "light" in the brain- scatter brained or not very smart
The word brained has one syllable.
"mindblowing," perhaps? maybe scatter brained