Dreadful; excellent (7)
I believe the answer is:
awesome
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">dreadful</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">excellent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for awesome that I've seen before include "Inspiring reverence mixed with fear" , "Amazing (sl.)" , "Inspiring admiration or wonder" , "Portentous" , "Instilling wonder" .)