| unsubstantial(adjective, dull, body, strong, light) |
| flimsy(adjective, strong, light, weak, slight) |
| feeble(adjective, dull, strong, light, weak) |
| slight(adjective, mean, light, weak, easy) |
| frail(adjective, strong, light, weak, slight) |
| thin(adjective, dull, mean, light, weak) |
| weak(adjective, dull, strong, light, soft) |
| fanciful(adjective, weak, strange, fantasy, imaginary) |
| fragile(adjective, strong, light, weak, slight) |
| immaterial(adjective, body, light, weak, slight) |
| intangible(adjective, light, weak, slight, fake) |
| tenuous(adjective, strong, light, weak, slight) |
| unreal(adjective, weak, fake, abstract, imaginary) |
| insignificant(adjective, weak, value, small, unimportant) |
| airy(adjective, light, weak, slight, easy) |
| trivial(adjective, light, slight, easy, thin) |
| illusory(adjective, weak, strange, fantasy, imaginary) |
| lightweight(adjective, light, slight, easy, thin) |
| poor(adjective, dull, mean, light, weak) |
| incorporeal(adjective, body, light, weak, abstract) |