| irresponsible(adjective, silly, foolish, stupid, fantastic) |
| teenage(adjective, young, adolescent) |
| childlike |
| girlish(adjective, infant, young) |
| inane(adjective, dull, silly, foolish, stupid) |
| inexperienced(adjective, raw, young, immature, childlike) |
| lightweight |
| mad(adjective, silly, foolish, unwise, unintelligent) |
| naive(adjective, dull, raw, green, inexperienced) |
| asinine |
| crazy(adjective, silly, foolish, stupid, fantastic) |
| flimsy(adjective, slight, poor, trivial, unimportance) |
| idle(unimportance, childish) |
| irrational(adjective, careless, silly, foolish, stupid) |
| unfledged(adjective, weak, raw, green, inexperienced) |
| weak(adjective, unimportance, childish) |
| pubescent(adjective, young, adolescent) |
| shallow(adjective, ignorant, unimportance, unintelligent) |
| sophomoric(adjective, inexperienced, impractical, half-baked, doomed) |
| stupid(adjective, dull, careless, silly, foolish) |