| ill-defined(adjective, weak, uncertain, vague, pale) |
| dull(adjective, quiet, weak, soft, gentle) |
| filmy(adjective, clear, light, dim, dense) |
| pale(adjective, dull, quiet, weak, soft) |
| smoggy(adjective, clear, obscure, cloudy, misty) |
| uncertain(adjective, rough, doubtful, unsettled, vague) |
| amorphous(adjective, obscure, rough, vague, unclear) |
| overcast(adjective, dull, soft, obscure, flat) |
| confused(adjective, slow, gloomy, uncertain, shaky) |
| doubtful(adjective, uncertain, shaky, vague, unclear) |
| gloomy(adjective, dull, flat, dark, heavy) |
| imprecise(adjective, obscure, rough, uncertain, vague) |
| indeterminate(adjective, uncertain, doubtful, vague, unclear) |
| muddy(adjective, dull, soft, obscure, flat) |
| muzzy |
| weak(adjective, dull, soft, gentle, obscure) |
| ambiguous(adjective, uncertain, doubtful, shaky, vague) |
| indistinguishable(adjective, obscure, vague, unclear, indistinct) |
| inexact(adjective, weak, obscure, rough, dark) |
| thick(adjective, dull, obscure, dirty, gray) |