Atrociously (7)
I believe the answer is:
awfully
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">atrociously</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for awfully that I've seen before include "Terribly" , "A lot" , "Frightfully" , "Very much" , "very badly" .)