RichThesaurus
inenubilable
vs
uncognoscible
inenubilable
adj
Inexplicable, mysterious, unclear.
Incapable of being cleared of clouds.
uncognoscible
adj
Synonym of incognoscible
How often have the words
inenubilable
and
uncognoscible
occurred in a corpus of books?
(source:
Google Ngram Viewer
)