| shaded(verb, adjective, shady, shaded) |
| sneaky(adjective, secret, private, clandestine, underground) |
| subliminal(adjective, unconscious, subconscious) |
| transcendental(obscure, dark, strange, mysterious, supernatural) |
| unavowed |
| unexpressed(adjective, obscure, dark, immense, indirect) |
| unintelligible(adjective, hard, obscure, solid, dark) |
| unobservable(adjective, invisible, latent) |
| unperceived(new, remote, mysterious, indefinite, unseen) |
| unpublished(adjective, clandestine, underground, undisclosed) |
| unseeable |
| unsung(adjective, strange, indefinite, unidentified) |
| vanished(verb, confused, out, lost, unchangeable) |
| viscerous(adjective, private, mental, inner) |
| withheld(adjective, secret, concealed, unseen) |
| abstract(hard, obscure, tricky, complicated, puzzling) |
| ambiguous(adjective, cover, obscure, dark, doubtful) |
| backstairs(unknowing, clandestine, underground, undisclosed, hermetical) |
| behind the curtain(expression, idiom, unknowing, hermetical, unbriefed) |
| behind the scenes(expression, idiom, unknowing, personal, confidential) |