| impenetrable(adjective, dark, sophisticated, mysterious, complicated) |
| overshadow(verb, cover, clear, confuse, hide) |
| secret(adjective, quiet, dark, superior, strange) |
| shade(verb, cover, shade, confuse, hide) |
| shadow(verb, close, cover, clear, block) |
| shady(adjective, dull, dark, gloomy, uncertain) |
| somber(adjective, dull, soft, flat, sad) |
| unfathomable(adjective, hard, difficult, solid, dark) |
| veiled(adjective, dull, dark, dim, secret) |
| befog(verb, clear, disturb, confuse, hide) |
| camouflage(verb, close, cover, block, suppress) |
| cloak(verb, close, cover, block, suppress) |
| indeterminate(adjective, rough, uncertain, doubtful, unsettled) |
| indistinguishable(adjective, vague, unknown, unclear, hazy) |
| unsung(adjective, strange, unknown, unfamiliar, indefinite) |
| unintelligible(adjective, hard, rough, difficult, solid) |
| ill-defined(adjective, weak, rough, dark, uncertain) |
| inscrutable(adjective, dark, strange, sophisticated, mysterious) |
| remote(adjective, quiet, cover, weak, dark) |
| tenebrous(adjective, dull, rough, difficult, dark) |