| unsound(adjective, strong, light, weak, slight) |
| gossamer(adjective, strong, light, weak, fine) |
| lame(adjective, weak, flat, poor, delicate) |
| shallow(adjective, strong, light, slight, thin) |
| superficial(adjective, strong, light, slight, thin) |
| unconvincing(adjective, weak, poor, thin, unreasonable) |
| unsteady(adjective, loose, uncertain, feeble, shaky) |
| wobbly(adjective, strong, light, weak, slight) |
| diaphanous(adjective, strong, light, weak, fine) |
| fine(adjective, light, weak, smooth, soft) |
| ramshackle(adjective, condition, feeble, shaky, unsound) |
| transparent(adjective, strong, light, fine, thin) |
| trifling(adjective, light, slight, easy, poor) |
| unbelievable(adjective, weak, poor, thin, informal) |
| unstable(adjective, weak, delicate, ill, sick) |
| breakable(adjective, weak, soft, gentle, delicate) |
| filmy(adjective, light, weak, soft, slight) |
| frivolous(adjective, slight, poor, detail, trivial) |
| gauzy(adjective, strong, light, weak, fine) |
| implausible(adjective, weak, poor, thin, unreasonable) |