Utter profanities (9)
I believe the answer is:
blaspheme
'utter profanities' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for blaspheme that I've seen before include "Speak irreverently about God" , "Curse profanely" , "Swear" , "Talk irreverently about God and sacred things" , "Curse, profane" .)