Gruesome, ghastly (7)
I believe the answer is:
macabre
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">gruesome</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(both can mean morbid or disturbing)</span><br/ ><br/ >'<span class="explanation-format__original">ghastly</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that ghastly can be written as macabre)</span><br/ ><br/ ></span>
(Other definitions for macabre that I've seen before include "'Grisly, gruesome (7)'" , "Gruesome, morbid" , "'Sinister, gruesome (7)'" , "Ghostly appearance" , "'Grim, repellent (7)'" .)