Inviolable (10)
I believe the answer is:
sacrosanct
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inviolable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that inviolable can be written as sacrosanct)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sacrosanct that I've seen before include "Too valuable to be changed" , "protected" , "Too valuable to touch" , "above criticism" , "Co-stars can (anag.)" .)