shatter-brained

from The Collaborative International Dictionary of English v.0.48

Shatter-brained \Shat"ter-brained`\, Shatter-pated
\Shat"ter-pat`ed\, a.
   Disordered or wandering in intellect; hence, heedless; wild;
   similar to {scatter-brained}. --J. Goodman.
   [1913 Webster +PJC]