| undeveloped(adjective, dull, weak, simple, slow) |
| immature(adjective, hidden, inexperienced, concealed, developed) |
| backward(adjective, dull, slow, impulsive, impractical) |
| stunted(adjective, weak, feeble, little, tiny) |
| undersized(adjective, weak, feeble, little, tiny) |
| rudimentary(adjective, simple, crude, naive, hidden) |
| developing |
| ignorant(simple, slow, crude, impulsive, basic) |
| dull(adjective, slow, backward, undeveloped) |
| half-baked(adjective, stupid, impulsive, impractical, young) |
| lagging(adjective, backward, precede) |
| premature(adjective, inexperienced, young, childish, undeveloped) |
| puny(adjective, weak, feeble, tiny) |
| short(adjective, little, undersized) |
| small(adjective, weak, feeble, little, tiny) |
| unformed(adjective, impulsive, inexperienced, half-baked, developed) |
| weak(adjective, feeble, tiny, developed) |
| embryonic(adjective, developed) |
| little(adjective, weak, feeble, tiny, undersized) |
| nonindustrial |