imperishably
advEtymology From imperishable + -ly.
1
In an imperishable manner.
- The occasion was private and there were no reporters, but Lord Roxton's speech was fixed verbatim in the minds of all his audience and has been imperishably preserved.1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019: