Lassitude, languor (8)
I believe the answer is:
lethargy
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lassitude</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that lassitude can be written as lethargy)</span><br/ ><br/ >'<span class="explanation-format__original">languor</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that languor can be written as lethargy)</span><br/ ><br/ ></span>
(Other definitions for lethargy that I've seen before include "Sloth" , "Lack of energy and enthusiasm" , "state of apathy" , "Lassitude, sluggishness" , "Inertia" .)