| faint(quiet, plain, imperceptible, discreet, inconspicuous) |
| guarded(adjective, cover, obscure, dark, hidden) |
| hermetic(obscure, complex, deep, mysterious, secret) |
| implied(adjective, cover, obscure, dark, hidden) |
| incomprehensible(adjective, obscure, difficult, dark, strange) |
| indirect(obscure, dishonest, cunning, deceitful, underhanded) |
| inexplicable |
| inscrutable |
| lurking(adjective, original, basic, fundamental, hidden) |
| opaque(adjective, hard) |
| perdu(adjective, hidden, imperceptible, covered, unseen) |
| profound(obscure, complex, deep, mysterious, abstruse) |
| protected |
| quiet(adjective, plain, personal, imperceptible, discreet) |
| remote(cover, obscure, dark, new, mysterious) |
| reserved(personal, confidential, hush-hush) |
| secretive(adjective, quiet, plain, strange, dishonest) |
| sequestered(secret, unknown, hidden, personal, confidential) |
| shadowy |
| sneak |