half-baked

Incomplete.

The guy had some half-baked idea for getting rich in the stock market.

Though Jevons's theory was more than half-baked, it needed more time in the oven, since he forgot to calculate that poor harvests in Asia would hit England only after a time lag.

Incomplete.

"You're cheap. Cheap education, cheap ideas, a half-baked bloody nobody."

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.

Mildly under the influence (of alcohol).

If you need to talk to John tonight, try to catch him early in the evening, while he's still only half-baked.

Used other than figuratively or idiomatically: Partially cooked by heating in an oven, either as an accidental outcome or as a work in process.

Near-synonyms: underbaked, dough-baked (dated)

The casserole was half-baked, but I choked it down anyway to be polite.