Profane, sinful (6)
I believe the answer is:
unholy
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">profane</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">sinful</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for unholy that I've seen before include "Godless" , "Depraved" , "Not sacred; outrageous" , "Base" , "Hellish" .)