| sequestered |
| shifty(dishonest, cunning, deceitful, sneaky, underhanded) |
| shrinking(adjective, calm, quiet, reasonable, mild) |
| shrouded(cover, obscure, dark, secret, hidden) |
| skulking(secret, private, hidden, sneak, sneaky) |
| slinking(secret, private, hidden, sneak, sneaky) |
| sly(dishonest, cunning, deceitful, secret, private) |
| smothered |
| sneaking(dishonest, cunning, deceitful, secret, private) |
| sneaky(dishonest, cunning, deceitful, secret, private) |
| soft(calm, quiet, reasonable, mild, controlled) |
| steady(adjective, calm, quiet, reasonable, mild) |
| stealthily(clandestine, secretly, slyly, underhandedly, surreptitiously) |
| stealthy(adjective, quiet, dishonest, secret, hidden) |
| stifled |
| sub-rosa(sensitive, dishonest, cunning, deceitful, secret) |
| sub rosa(expression, adjective, show, secret, clandestine) |
| subdued(calm, quiet, reasonable, mild, controlled) |
| subterranean(adjective, hidden, underground) |
| suppressed |