half-baked

adjective

1. insufficiently cooked.
2. not completed; insufficiently planned or prepared: a half-baked proposal for tax reform.
3. lacking mature judgment or experience; unrealistic.

adjective

1. insufficiently baked
2. informal foolish; stupid
3. informal poorly planned or conceived

adj.

1620s as “underdone;” 1855 in sense of “silly;” see half + bake (v.).