| protection(noun, cover, attack, screen, shelter) |
| reticent(mysterious, private, taciturn, clandestine, underground) |
| roost(noun, cover, protection, abode, shed) |
| secluse(close, quiet, private, isolated, secluded) |
| secondary(cover, obscure, dark, equivocal, ulterior) |
| sequestered(close, quiet, private, unknown, hidden) |
| sheltered(close, quiet, private, isolated, cloistered) |
| shifty(mean, smooth, dishonest, cunning, deceitful) |
| sidelong |
| slinking(secret, private, hidden, sneaky, secretive) |
| stealthily |
| sub-rosa(secret, private, hidden, spy, clandestine) |
| subterranean(adjective, hidden, underground) |
| subtle(adjective, mean, smooth, cunning, knowing) |
| surreptitiously |
| tunnel |
| umbrella(noun, cover, protection, shed, sanctuary) |
| underlying |
| underneath(secret, hidden, spy) |
| unexpressed(adjective, cover, obscure, dark, hidden) |