| premature(inexperienced, young, childish, undeveloped, unformed) |
| simple(adjective, imbecility folly) |
| sissy(adjective, like) |
| small(adjective, light, slight, little, minute) |
| spoiled(adjective, like) |
| teen |
| teenage |
| teenaged |
| tender(weak, green, inexperienced, young, childish) |
| underdeveloped(inexperienced, young, childish, undeveloped, unformed) |
| undergrown(inexperienced, young, childish, undeveloped, unformed) |
| undeveloped(limited, meager, inexperienced, young, childish) |
| unfinished(inexperienced, young, childish, undeveloped, unformed) |
| unformed(inexperienced, young, childish, undeveloped) |
| unripe(weak, tender, green, inexperienced, young) |
| unseasonable(inexperienced, young, childish, undeveloped, unformed) |
| unseasoned(inexperienced, young, childish, undeveloped, unformed) |
| unsophisticated(adjective, innocent, inexperienced, young, childlike) |
| untimely(inexperienced, young, childish, undeveloped, unformed) |
| unweaned(adjective, tender, green, young, childish) |