| under-the-table(adjective, sensitive, secret, private, clandestine) |
| behind-the-scenes |
| furtive(adjective, dishonest, secret, clandestine, sneaky) |
| covert(adjective, secret, private, hidden, clandestine) |
| hush-hush(adjective, dishonest, secret, clandestine, sneaky) |
| secret(adjective, sensitive, dishonest, cunning, deceitful) |
| surreptitious(adjective, dishonest, secret, clandestine, sneaky) |
| undercover(adjective, dishonest, cunning, deceitful, secret) |
| artful(adjective, sneaky, covert, secretive) |
| backdoor(adjective, close, sensitive, clandestine, underground) |
| backstairs(adjective, close, sensitive, clandestine, underground) |
| calculating(adjective, sneaky, covert, secretive) |
| camouflaged(adjective, close, clandestine, underground, undisclosed) |
| cautious(adjective, sneaky, covert, secretive) |
| circumspect(adjective, sneaky, covert, secretive) |
| clandestine(adjective, dishonest, deceitful, secret, sneaky) |
| classified(adjective, sensitive, secret, clandestine, underground) |
| close(adjective, clandestine, underground, undisclosed, furtive) |
| concealed(adjective, dishonest, cunning, deceitful, secret) |
| confidential(adjective, secret, hidden, spy, clandestine) |