(adj) foolish; totally unsound, Syn. screwball, half-baked, softheaded, Example:a crazy scheme; half-baked ideas; a screwball proposal without a prayer of working
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Marked with spots and patches of white and some color other than black; -- usually distinguished from piebald, in which the colors are properly white and black. Said of horses. [ 1913 Webster ]