Foolish; totally unsound:
— Half-baked ideas.

synonyms: crazy, screwball, softheaded.

Roget 730: not completed etc. v.; incomplete etc. 53; uncompleted, unfinished, unaccomplished, unperformed, unexecuted; sketchy, addle.    in progress, in hand; ongoing, going on, proceeding; on one's hands; on the anvil; in the fire, in the oven.    parboiled, half-baked.    ... show more

Insufficiently cooked.

synonym: underdone.