Awfully (8)
I believe the answer is:
terribly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">awfully</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for terribly that I've seen before include "In a dreadful manner" , "Very badly" , "In an awful manner" , "Awfully, frightfully" .)