A half-baked scheme.
A half-baked visionary.
When the casserole is half-baked, take it out and sprinkle the grated cheese on top.
The guy had some half-baked idea for getting rich in the stock market.
half-baked Government ideas like ID cards.
half-baked plan which would simply mean people paying more in the long-run.
half-baked theories of the lecture room are given to the world as firmly established truths.