Found 2 items, similar to birdbrain.
English → English (WordNet) Definition: birdbrain birdbrain n : a person with confused ideas; incapable of serious thought [syn: addle-head, addlehead, loon]
English → English (gcide) Definition: birdbrain birdbrain \bird"brain`\ n. 1. a person with confused ideas; incapable of serious thought. Syn: addle-head, loon. [WordNet 1.5]