Horrifying (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">horrifying</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that horrifying can be written as frightful)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for frightful that I've seen before include "horrible" , "ghastly" , "Terrible, awful" , "nasty" , "very bad" .)
(Other definitions for atrocious that I've seen before include "Horrifyingly wicked" , "Terrible" , "Shocking" , "Horrifying" , "Extremely bad" .)