adjective: Foolish; reckless; ridiculous.

From the allusion that a harebrained person has the brain as small as a hare’s. From Old English hara (hare) + braegen (brain). Earliest documented use: 1548.

HARE-TRAINED - well-schooled in the Krishna movement, a branch of Hinduism, formally known as Gaudiya Vaishnavism

HATE-BRAINED - skin-headed

SHARE-BRAINED - forwarding email and internet messages without any consideration of their appropriateness or even truth