| invisibleness |
| mysterious(obscure, dark, secret, unknown, hidden) |
| mystic(obscure, dark, secret, unknown, hidden) |
| mystical(obscure, dark, secret, unknown, hidden) |
| not noticed(expression, idiom) |
| not observed(expression, idiom) |
| out-of-the-way(obscure, unknown, clandestine, underground, undisclosed) |
| out of view(expression, idiom, obscure, dark, unknown) |
| passed by(expression, ignored, undiscovered, overlooked, unobserved) |
| pushed aside(expression, ignored, undiscovered, overlooked, unobserved) |
| reticent(obscure, unknown, clandestine, underground, undisclosed) |
| retired(obscure, unknown, clandestine, underground, undisclosed) |
| screened(obscure, dark, secret, hidden, imperceptible) |
| secluded(obscure, dark, secret, unknown, hidden) |
| secretive(clandestine, underground, undisclosed) |
| sensed(verb, imagined) |
| sequestered(obscure, dark, secret, unknown, hidden) |
| shadowy(obscure, dark, secret, unknown, hidden) |
| shelved |
| shunted |