Synonyms of hush-hush
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confidentialInformation that is confidential is meant to be kept secret or private.
• She accused them of leaking confidential information.
secretprivateintimateclassifiedprivy (archaic)off the recordhush-hush (informal)closed or closed sourceprotected
restrictedA restricted document is one that only people with special permission can read.
• a highly restricted document
secretIf something is secret, it is known about by only a small number of people, and is not told or shown to anyone else.
• Soldiers have been training at a secret location.
Thesaurus for hush-hush from the Collins English Thesaurus