| slinking(adjective, quiet, secret, private, sneaky) |
| under cover(expression, idiom, secret, spy, covert) |
| arcane(adjective, secret, clandestine, underground, undisclosed) |
| buried(adjective, secret, hidden, clandestine, underground) |
| cagey(mean, smooth, cunning, knowing, sly) |
| camouflaged(adjective, secret, hidden, clandestine, underground) |
| chary(adjective, caution) |
| circumspect(adjective, caution, sneaky, covert, secretive) |
| classified(adjective, secret, clandestine, underground, undisclosed) |
| cloaked(adjective, secret, hidden, clandestine, concealed) |
| close(clandestine, underground, undisclosed, concealment) |
| crooked(mean, smooth, dishonest, cunning, deceitful) |
| disguised(adjective, secret, hidden, clandestine, concealed) |
| esoteric(clandestine, underground, undisclosed) |
| in ambush(expression, clandestine, underground, undisclosed) |
| ingenious(mean, smooth, cunning, knowing, sly) |
| intriguing(quiet, mean, smooth, cunning, knowing) |
| masked(adjective, secret, hidden, concealed, sneaky) |
| mystical(clandestine, underground, undisclosed) |
| obscured(adjective, secret, hidden, clandestine, underground) |