birdbrain

plural birdbrains

1. colloquialSomeone who is not intelligent.

   That birdbrain just drove right through three rows of traffic cones and into the bushes.

   1 more example

   Comedienne Carol Channing, 29, admitted that a grave personal problem had grown out of her playing the role of birdbrained Lorelei Lee in Broadway’s Gentlemen Prefer Blondes. People seemed to be convinced that she is a birdbrain offstage, too: “I won't say that people actually think I’m just two steps removed from outright idiocy, but they do seem to have adopted a protective attitude towards me...”

   1950 February 27, Time, page 38