unpermissible

comparative more unpermissible · superlative most unpermissible

1. Not permissible.

   For this was unpermissible, foolish, dangerous, and he meant to stop it in the bud.

   1910, Algernon Blackwood, The Wendigo

   1 more example

   For not only did he find it piteous; but unseemly, unpermissible somehow, yet marvellously sweet, startling him out of all preconceived light diplomatic plans, plucking shrewdly at his complacently unawakened heart.

   1919, Lucas Malet, Deadham Hard