Revoltingly (9)
I believe the answer is:
hideously
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">revoltingly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hideously that I've seen before include "in a horrible way" , "in unattractive fashion" , "in a frightful way" .)