| shrewd(adjective, mean, smooth, cunning, knowing) |
| slinky(adjective, move) |
| subtle(adjective, mean, smooth, false, cunning) |
| tricky(adjective, mean, smooth, dishonest, cunning) |
| underground(adjective, secret, hidden, spy, clandestine) |
| underhanded(adjective, dishonest, cunning, deceitful, clandestine) |
| acute |
| closet(adjective, clandestine, underground, undisclosed) |
| confidential(adjective, secret, hidden, spy, clandestine) |
| diplomatic |
| discreet(adjective, caution, clandestine, underground, undisclosed) |
| evasive(adjective, cunning, concealment, sneaky, covert) |
| foxy(adjective, mean, smooth, false, sly) |
| guileful(adjective, mean, smooth, false, dishonest) |
| hole-and-corner(secret, private, hidden, spy, sneaky) |
| knowing |
| noiseless(adjective, quiet, secretive) |
| quiet(adjective, intriguing) |
| scheming(adjective, mean, smooth, cunning, knowing) |
| silent(adjective, quiet, secretive) |