| changeful(fickle, untrustworthy, unprincipled, dirty-dealing) |
| cloak-and-dagger(obscure, unknown, clandestine, underground, undisclosed) |
| cloak and dagger(expression, idiom, obscure, unknown, unrevealed) |
| closet(obscure, unknown, clandestine, underground, undisclosed) |
| clouded(obscure, unknown, clandestine, underground, undisclosed) |
| committing perjury(expression, fickle, untrustworthy, unprincipled, dirty-dealing) |
| confidentiality |
| controlled(private, confidential) |
| covered up |
| crafty(dishonest, cunning, deceitful, sneaky, underhanded) |
| creep(secret, hidden, spy, covert, undercover) |
| cretinous(unknowing, hermetical, unbriefed) |
| crooked(dishonest, cunning, deceitful, sneaky, underhanded) |
| cunning(dishonest, deceitful, sneaky, underhanded, underhand) |
| curt(reserved, reticent, taciturn) |
| deceitful(dishonest, sneaky, underhanded) |
| deceptive(dishonest, cunning, deceitful, sneaky, underhanded) |
| deep(obscure, unknown, clandestine, underground, undisclosed) |
| devious(dishonest, cunning, deceitful, sneaky, underhanded) |
| dirty dealing(expression, dishonest, deceitful, fickle, untrustworthy) |