| enigmatic(cover, obscure, dark, equivocal, sneak) |
| esoteric(clandestine, underground, undisclosed) |
| mysterious(clandestine, underground, undisclosed) |
| obscure(cover, dark, secret, hidden, equivocal) |
| obscured(cover, obscure, dark, secret, hidden) |
| occult(clandestine, underground, undisclosed) |
| recondite(secret, hidden, clandestine, underground, undisclosed) |
| restricted(secret, clandestine, underground, undisclosed, top-secret) |
| secluded(clandestine, underground, undisclosed) |
| surreptitious(adjective, dishonest, secret, hidden, underground) |
| top-secret(secret, clandestine, underground, undisclosed) |
| under cover(expression, cover, obscure, dark, secret) |
| undisclosed(cover, obscure, dark, equivocal, clandestine) |
| undivulged(cover, obscure, dark, equivocal, ulterior) |
| unknown(clandestine, underground, undisclosed) |
| unrevealed(clandestine, underground, undisclosed) |
| artful(hidden, fraudulent, sneaky, covert, secretive) |
| beclouded |
| blind |
| bottled up(expression, adjective, calm, quiet, reasonable) |