Wiktionary
uninscribable
a. Not inscribable.
Usage examples of "uninscribable".
This bore regular fruit, for after the first interview the manuscript records daily calls of the young man, during which he related startling fragments of nocturnal imaginery whose burden was always some terrible Cyclopean vista of dark and dripping stone, with a subterrene voice or intelligence shouting monotonously in enigmatical sense-impacts uninscribable save as gibberish.