Undisclosed
Part of speech: adjective
Definition: Not disclosed; kept secret.
Covert
Part of speech: adjective
Definition: Partially hidden, disguised, secret, surreptitious.Covered.
Part of speech: noun
Definition: Area of thick undergrowth where animals hide.
Example sentence: In reality the workings of your governing system are opaque and covert, while hiding in the chattering spotlight of an ostensible transparency, even though the ultimate objective is clear.