i Register
In some senses, lamebrain is marked as derogatory, slang. Watch for register when choosing this word.
noun
A fool.
You lamebrain! How could you do something so stupid?
adj
lamebrained, foolish
We're not going to introdce the lame brain legislation [NGTF] is talking about. We want solid stuff. We want to talk about opening up billions of dollars of funding into mental health and social services, for all alternative lifestyles not just gays.