Sacrilegious (11)
I believe the answer is:
blasphemous
'sacrilegious' is the definition.
(I know that sacrilegious can be written as blasphemous)
This is the entire clue.
(Other definitions for blasphemous that I've seen before include "Sacriligious" , "Cursing" , "Irreverent towards sacred things" , "Sacrilegious in talk" , "Profane" .)