| covered(adjective, obscure, unknown, hidden, concealed) |
| detailed(adjective, intimate, private, personal, innermost) |
| discreet(adjective, personal, clandestine, underground, undisclosed) |
| exclusive(adjective, individual, private, personal, confidential) |
| exhaustive(adjective, intimate, private, personal, innermost) |
| inscrutable(adjective, dark, strange, uncertain, blank) |
| insidious(adjective, mean, smooth, dishonest, cunning) |
| obscured(adjective, separate, hidden, concealed, underhanded) |
| penetrating(adjective, heavy, deep, thoughtful, serious) |
| privileged(adjective, sensitive, private, confidential, classified) |
| retired(verb, adjective, close, quiet, obscure) |
| sneak(adjective, clandestine, underground, undisclosed, underhand) |
| thorough(adjective, deep, thoughtful, intimate, private) |
| trick(noun, expertise) |
| ulterior(adjective, separate, unknown, hidden, concealed) |
| unacknowledged(adjective, sensitive, unknown, clandestine, undisclosed) |
| unavowed |
| whodunit(noun, question, puzzle, perplexity, obscurity) |
| code(noun, confidence, mystery, unrevealed, enigma) |
| backstairs(adjective, sensitive, clandestine, underground, undisclosed) |