ultrasecret

adjective
ul·​tra·​se·​cret | \ ˌəl-trə-ˈsē-krət How to pronounce ultrasecret (audio) \

Definition of ultrasecret

: extremely or extraordinarily secret, private, or confidential ultrasecret information an ultrasecret military operation

First Known Use of ultrasecret

1874, in the meaning defined above

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The first known use of ultrasecret was in 1874

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