| unrevealed(adjective, secret, unknown, hidden, concealed) |
| artful(adjective, false, secret, sly, deceptive) |
| closet(noun, adjective, special, intimate, secret) |
| dishonest(adjective, secret, sneaky, stealthy) |
| fraudulent(adjective, dishonest, cunning, deceitful, secret) |
| invisible(adjective, latent) |
| mystic(adjective, secret, unknown, hidden, underground) |
| oblique(dishonest, cunning, deceitful, sneaky, underhanded) |
| restricted(adjective, secret, underground, undisclosed, top-secret) |
| tight-lipped(adjective, secret, sneaky, stealthy) |
| unexposed(adjective, latent) |
| auricular |
| back-door |
| buried(adjective, secret, unknown, hidden, concealed) |
| camouflaged(adjective, secret, hidden, underground, undisclosed) |
| conspiratorial(adjective, underground, undisclosed, sneaky, covert) |
| deceptive(false, dishonest, cunning, deceitful, artful) |
| devious(dishonest, cunning, deceitful, sneaky, underhanded) |
| esoteric(adjective, secret, unknown, hidden, underground) |
| evasive(sneaky, covert, secretive) |