| unwitnessed(adjective, covert, stealthy, unnoticed) |
| background |
| behind the scenes(expression, idiom) |
| camouflaged(obscure, secret, unknown, hidden, covered) |
| cryptic(adjective, obscure, dark, secret, unknown) |
| curtained(verb, adjective, hidden, imagined) |
| disguised(obscure, secret, unknown, hidden, imperceptible) |
| neglected(neglect, ignored, undiscovered, overlooked, unobserved) |
| private(adjective, obscure, secret, unknown, hidden) |
| recondite(adjective, obscure, dark, secret, unknown) |
| spiritual world(noun, expression, idiom) |
| unacknowledged(adjective, covert, stealthy, unnoticed) |
| unconsidered(ignored, undiscovered, overlooked, unobserved) |
| undetectable |
| undisclosed(obscure, dark, unknown, hidden, imperceptible) |
| unexposed(obscure, dark, secret, unknown, hidden) |
| unrevealed(obscure, dark, secret, unknown, hidden) |
| unspied |
| abstruse(obscure, dark, secret, unknown, hidden) |
| arcane(adjective, obscure, unknown, clandestine, underground) |