| thick-skulled |
| absurd(adjective, foolish, impractical, half-baked, doomed) |
| asinine(adjective, foolish) |
| crackpot(adjective, foolish, impractical, half-baked, doomed) |
| dimwitted(adjective, slang, ability, stupid) |
| dotty(adjective, foolish) |
| dull(adjective, slow, stupid) |
| goofy(adjective, foolish, impractical, half-baked, doomed) |
| half-baked(adjective, stupid, impulsive, impractical, doomed) |
| half-witted(adjective, simple, foolish, stupid) |
| ignorant(adjective, dull, slow, foolish, stupid) |
| imbecilic(adjective, dull, slow, foolish, stupid) |
| numskulled(dull, slow, stupid) |
| thick-witted(adjective, ability, stupid) |
| wooden-headed |
| blockish(adjective, simple, stupid) |
| fatuous(impractical, half-baked, doomed) |
| hebetudinous(adjective, dull, simple, ability, slow) |
| insane(impractical, half-baked, doomed) |
| silly(impulsive, impractical, half-baked, doomed, unplanned) |