Listless; indolent (13)
I believe the answer is:
lackadaisical
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">listless</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">indolent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for lackadaisical that I've seen before include "Listless" , "Spiritless" , "Lethargic" , "Wanting enthusiasm" , "Apathetic" .)