| obtuse(adjective, innocent, thick, unfamiliar, unconscious) |
| occult(obscure, dark, secret, unknown, hidden) |
| on the QT(expression, adjective, idiom, reticent, taciturn) |
| out of it(expression, adjective, idiom, blank, ignorant) |
| out of view(expression, adjective, idiom, obscure, dark) |
| out to lunch(expression, adjective, idiom, ignorant, unaware) |
| private(mysterious, secret, reticent, unknown, hidden) |
| recondite(obscure, dark, secret, unknown, hidden) |
| reserved(mysterious, private, reticent, taciturn, uncommunicative) |
| screened(obscure, dark, secret, unknown, hidden) |
| secluded(obscure, dark, secret, unknown, hidden) |
| secretive(adjective, mysterious, private, reticent, unknowing) |
| secretly |
| sequestered(obscure, dark, secret, unknown, hidden) |
| shadowy(obscure, dark, secret, unknown, hidden) |
| shallow(adjective, innocent, thick, unfamiliar, unconscious) |
| shrouded(adjective, secret, unknown, hidden, unknowing) |
| silent(mysterious, private, reticent, taciturn, uncommunicative) |
| sotto voce |
| sub rosa |