| secret(adjective, quiet, show, dishonest, deceitful) |
| covert(adjective, show, secret, private, restricted) |
| furtive(adjective, secret, sly, sneaky, secretive) |
| surreptitious(adjective, dishonest, deceitful, secret, hidden) |
| hidden(verb, adjective, secret, sly, underground) |
| undercover(adjective, adverb, show, dishonest, secret) |
| concealed(adjective, obscure, secret, unknown, hidden) |
| private(adjective, intimate, secret, unknown, hidden) |
| stealthy(adjective, quiet, dishonest, secret, hidden) |
| underhand(adjective, deceitful, secret, sly, sneaky) |
| hush-hush(adjective, adverb, show, informal, dishonest) |
| confidential(adjective, special, intimate, secret, hidden) |
| underground(adjective, secret, unknown, hidden, sly) |
| cryptic(adjective, secret, unknown, hidden, concealed) |
| hole-and-corner(adjective, secret, private, hidden, spy) |
| hugger-mugger(adjective, quiet, intriguing) |
| sneaky(adjective, quiet, dishonest, deceitful, secret) |
| secretive(adjective, secret, sneaky, stealthy) |
| arcane(adjective, secret, hidden, underground, undisclosed) |
| privy(adjective, special, intimate, secret, hidden) |