hush-hush ( synonym found)
Definition of hush-hush:

°Secret, not spoken of (or spoken of only in hushed whispers between insiders).
"The spy program was very hush-hush, no one ever spoke of it."
Definition of hush-hush:

°Secret, not spoken of (or spoken of only in hushed whispers between insiders).
"The spy program was very hush-hush, no one ever spoke of it."
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