| unknown(adjective, obscure, dark, superior, strange) |
| vague(adjective, obscure, difficult, uncertain, doubtful) |
| blind(adjective, show, hidden, covered) |
| cabalistic(adjective, hard, evil, obscure, dark) |
| dim(quiet, plain, dark, blind, inconspicuous) |
| essential(adjective, individual, original, basic, fundamental) |
| hid |
| indiscernible(adjective, invisible) |
| mystical(adjective, evil, obscure, dark, strange) |
| subtle(adjective, quiet, plain, imperceptible, discreet) |
| under cover(expression, adjective, idiom, cover, show) |
| undercover(adjective, obscure, dishonest, cunning, secret) |
| underhand(adjective, dishonest, cunning, deceitful, secret) |
| unseen(adjective, hidden) |
| censored(verb, adjective) |
| close |
| clouded(verb, secret, unknown, hidden, unseen) |
| deep(adjective, hard, evil, obscure, meaning) |
| dormant |
| enshrouded(verb, adjective, hidden, protected, covered) |