| lax(adjective, unclear, chaotic, indistinguishable) |
| mysterious(adjective, doubtful, vague, unclear, ambiguous) |
| puzzling(uncertain, vague, confused, unclear, ambiguous) |
| questionable(uncertain, doubtful, shaky, vague, hesitant) |
| subtle(adjective, quiet, slight, fine, thin) |
| unnoticeable(adjective, quiet, plain, subtle, imperceptible) |
| veiled |
| adumbrate |
| caliginous(adjective, dull, dark, gloomy, dim) |
| cryptic(uncertain, vague, unclear) |
| diffuse(adjective, shapeless) |
| dingy(adjective, dull, soft, obscure, flat) |
| disorganized(adjective, rough, chaotic, unformed, amorphous) |
| dun(adjective, dull, soft, obscure, flat) |
| faltering(adjective, weak, pale, confused, rambling) |
| grimy(adjective, dull, soft, obscure, flat) |
| hoarse(adjective, weak, rough, pale, gruff) |
| impalpable(adjective, unclear, subtle, imperceptible, unremarkable) |
| inchoate(adjective, chaotic) |
| indefinable |