Insipid, lifeless (5)
I believe the answer is:
vapid
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">insipid</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that insipid can be written as vapid)</span><br/ ><br/ >'<span class="explanation-format__original">lifeless</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 vapid that I've seen before include "Offering no stimulation" , "Dull, insipid, flat" , "Dull and tasteless" , "Wishy-washy" , "Boring, flat" .)