Wiktionary
unallowed
a. Not allowed, forbidden.
Usage examples of "unallowed".
With Mila, Solanka had allowed himself to sink toward the sickly allure of the unmentionable, the unallowed, whereas when Neela wrapped herself around him the opposite was true, everything became mentionable and was mentioned, everything was allowable and allowed.
Was it the unrecognized, unallowed sense, that the one of all the world who most longed to have him obey that word, might be today beyond seeing him obey it -- for ever?