| cockeyed(silly, foolish, fantastic, unwise, impractical) |
| cracked(simple, silly, foolish, unsound, unwise) |
| crackpot(impractical, doomed) |
| dabbling |
| daffy(adjective, weak, simple, slow, silly) |
| dippy(weak, simple, silly, foolish, thoughtless) |
| dotty(weak, simple, silly, foolish, thoughtless) |
| dull(adjective, simple, slow, foolish, stupid) |
| early(adjective, early) |
| fatuous(weak, simple, silly, foolish, fantastic) |
| feeble-minded(adjective, simple, slow, stupid, boring) |
| half-hearted |
| half baked(expression, adjective, idiom, person) |
| hasty(slight, detail, foolish, casual, trivial) |
| ill-conceived(adjective, silly, foolish, stupid, fantastic) |
| ill-considered(adjective, weak, simple, silly, foolish) |
| impracticable(silly, foolish, fantastic, unwise, unlikely) |
| impulsive(adjective, unplanned, imprudent, misguided, intuitive) |
| inadequate |
| indifferent |