| covert(adjective, secret, private, hidden, clandestine) |
| furtive(adjective, secret, private, hidden, clandestine) |
| sub-rosa(adjective, sensitive, secret, private, hidden) |
| behind-the-scenes(adjective, secret) |
| hush-hush(adjective, secret, private, hidden, clandestine) |
| secret(adjective, sensitive, private, hidden, clandestine) |
| surreptitious(adjective, secret, hidden, clandestine, sneaky) |
| backstairs(sensitive, unknowing, clandestine, underground, undisclosed) |
| clandestine(secret, private, hidden, underground, sneaky) |
| privy(secret, hidden, clandestine, underground, underhanded) |
| shifty(sneaky, covert, secretive) |
| skulking(secret, private, hidden, sneaky, covert) |
| sly(secret, private, hidden, clandestine, sneaky) |
| sneaking(secret, private, hidden, sneaky, covert) |
| sneaky(secret, private, hidden, clandestine, underground) |
| stealthy(secret, private, hidden, clandestine, sneaky) |
| unauthorized(secret, private, hidden, sneaky, covert) |
| undercover(secret, private, hidden, clandestine, sneaky) |
| underground(secret, clandestine, undisclosed) |
| underhanded(secret, hidden, clandestine, underground, sneaky) |