| asinine(weak, simple, careless, silly, foolish) |
| balmy(silly, foolish, fantastic, unwise, impractical) |
| birdbrained(adjective, foolish, stupid, impulsive, unintelligent) |
| blockheaded(adjective, stupid, impulsive, impractical, doomed) |
| boneheaded(adjective, stupid, impulsive, impractical, doomed) |
| cuckoo(silly, foolish, unwise) |
| dilettante(adjective, amateurish) |
| fledgling(adjective, person) |
| indiscreet(adjective, dull, weak, simple, silly) |
| ineffectual(incompetent, incoherent, wasteful, unproductive) |
| mad(weak, simple, silly, foolish, thoughtless) |
| nonsensical(dull, simple, silly, foolish, stupid) |
| pale |
| poor |
| short-sighted(adjective, simple, foolish, stupid, fantastic) |
| softheaded |
| underdeveloped(adjective, stupid, impulsive, impractical, young) |
| untimely(adjective, early) |
| amateurish |
| batty(adjective, silly, foolish, stupid, impulsive) |