Synonyms of 'hush-hush'
secretDictionary, confidential, classified
Though these meetings were hush-hush there were sometimes leaks.
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Information that is confidential is meant to be kept secret or private.
She accused them of leaking confidential information.
A restricted document is one that only people with special permission can read.
a highly restricted document
Thesaurus for hush-hush from the Collins English Thesaurus
Something that is hush-hush is secret and not to be discussed with other people.