hush-hush
adjective/ˌhʌʃ ˈhʌʃ/
/ˌhʌʃ ˈhʌʃ/
(informal)- secret and not known about by many people
- Their wedding was very hush-hush.
Check pronunciation:
hush-hush
Definition of hush-hush adjective from the Oxford Advanced Learner's Dictionary