supersecret

adjective

su·​per·​se·​cret ˌsü-pər-ˈsē-krət 

: extremely secret, private, or confidential

a supersecret government agency

Examples of supersecret in a Sentence

Recent Examples on the Web

After all, a message being delivered by the nation’s biggest bank — and a group of chief executives and former senior policymakers — may only encourage the idea that there is a supersecret cabal of puppeteers steering policy. —New York Times, 19 Jan. 2021

Word History

First Known Use

1891, in the meaning defined above