Adjective
Inexpressible.
Source: Webster's dictionaryScholem ... says that Jewish mystics have always tried to project their own thought into the biblical texts; as a matter of fact, every unexpressible reading of a symbolic machinery depends on such a projective attitude. Umberto Eco
The best of us being unfit to die, what an unexpressible absurdity to put the worst to death. Nathaniel Hawthorne