| unripe(adjective, hidden, inexperienced, concealed, young) |
| untimely(adjective, inexperienced, young, childish, undeveloped) |
| vestigial(adjective, simple, crude, naive, hidden) |
| adolescent(inexperienced, young, childish, undeveloped, unformed) |
| atavistic(adjective, simple, rough, crude, basic) |
| austere(adjective, simple, rough, crude, basic) |
| baby(inexperienced, young, childish, undeveloped, unformed) |
| babyish(inexperienced, young, childish, undeveloped, unformed) |
| bantam(adjective, little, undersized) |
| brutish(adjective, simple, rough, crude, basic) |
| childlike(adjective, simple, rough, crude, basic) |
| coarse |
| deficient |
| diminutive(adjective, weak, feeble, little, tiny) |
| dwarf(adjective, little, undersized) |
| dwarfed(adjective, little, undersized) |
| dwarfish(adjective, little, undersized) |
| early |
| failing |
| feeble-minded(adjective, dull, impulsive, impractical, backward) |