Definitions for half-baked
Random House Webster's College Dictionary
not completed; insufficiently planned or prepared:
a half-baked proposal.
lacking mature judgment or experience; unrealistic:
Origin of half-baked:
crazy, half-baked, screwball, softheaded(adj)
foolish; totally unsound
"a crazy scheme"; "half-baked ideas"; "a screwball proposal without a prayer of working"
Incomplete; not fully planned or carefully considered, ill-conceived, unsound or badly thought-out; foolish or having no common sense.
The guy had some half-baked idea for getting rich in the stock market.