| Solution | Length | |
|---|---|---|
| 4 letters | ||
| amso | 4 | |
| weak | 4 | |
| isso | 4 | |
| 5 letters | ||
| amtoo | 5 | |
| istoo | 5 | |
| IDOSO | 5 | |
| canso | 5 | |
| young | 5 | |
| silly | 5 | |
| inane | 5 | |
| trite | 5 | |
| 6 letters | ||
| arenot | 6 | |
| simple | 6 | |
| paltry | 6 | |
| futile | 6 | |
| boyish | 6 | |
| senile | 6 | |
| unwise | 6 | |
| jejune | 6 | |
| 7 letters | ||
| babyish | 7 | |
| prattle | 7 | |
| trivial | 7 | |
| foolish | 7 | |
| puerile | 7 | |
| UNADULT | 7 | |
| 8 letters | ||
| immature | 8 | |
| youthful | 8 | |
| imbecile | 8 | |
| juvenile | 8 | |
| nugatory | 8 | |
| trifling | 8 | |
| 9 letters | ||
| infantine | 9 | |
| infantile | 9 | |
| pediatric | 9 | |
| 11 letters | ||
| nonsensical | 11 | |