Half-baked Meaning

Example : Used other than as an idiom: Partially cooked by heating in an oven.  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.1960, P. G. Wodehouse, Jeeves in the Offing, chapter XVII:  She came skipping to me just now, clapping her little hands and bleating about how very, very happy she was, dear Mrs Travers. The silly young geezer. I nearly conked her one with my trowel. I'd always thought her half-baked, but now I think they didn't even put her in the oven.