| hole-and-corner(adjective, private, hidden, spy, sneaky) |
| innate(adjective, intimate, private, mental, penetrating) |
| restricted(adjective, close, private, hidden, clandestine) |
| underground(adjective, unknown, hidden, spy, concealed) |
| veiled(adjective, hidden, clandestine, concealed, covered) |
| cabalistic(adjective, evil, obscure, strange, humble) |
| camouflaged(adjective, obscure, hidden, clandestine, concealed) |
| essential(adjective, individual, intimate, private, mental) |
| sly(adjective, quiet, dishonest, deceitful, clever) |
| confidence(noun, hint, exclusive, buzz, gossip) |
| cloak-and-dagger(adjective, show, full, hidden, clandestine) |
| incomprehensible(adjective, obscure, dark, strange, uncertain) |
| inmost(adjective, intimate, private, penetrating, personal) |
| lonely(adjective, close, quiet, remote, private) |
| off the record(expression, adjective, idiom, separate, private) |
| strange(adjective, property, new, remote, odd) |
| under wraps(expression, adjective, idiom, adverb, show) |
| underhanded(adjective, dishonest, cunning, deceitful, clandestine) |
| unseen(adjective, unknown, hidden, covered, dormant) |
| autogenous(adjective, inside, central, interior, inner) |