| falsified |
| feinted |
| fostered(adjective, secure, guarded, sheltered, shielded) |
| fronted |
| glossed |
| guaranteed(adjective, secure, guarded, sheltered, shielded) |
| harbored(verb, adjective, secure, guarded, sheltered) |
| hidden away(verb, expression, phrasal verb) |
| huggermugger(adjective, secret) |
| immune(adjective, secure, guarded, sheltered, shielded) |
| improved |
| low-key(quiet, plain, imperceptible, discreet, inconspicuous) |
| modest(quiet, plain, imperceptible, discreet, inconspicuous) |
| muted(quiet, plain, imperceptible, discreet, inconspicuous) |
| mysterious(obscure, unknown, clandestine, underground, undisclosed) |
| mystic(obscure, unknown, clandestine, underground, undisclosed) |
| mystical(obscure, unknown, clandestine, underground, undisclosed) |
| occult(obscure, unknown, clandestine, underground, undisclosed) |
| on the QT(expression, idiom, obscure, unknown, clandestine) |
| out-of-the-way(obscure, unknown, clandestine, underground, undisclosed) |