Tedious, fatiguing (9)
I believe the answer is:
wearisome
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">tedious</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that tedious can be written as wearisome)</span><br/ ><br/ >'<span class="explanation-format__original">fatiguing</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for wearisome that I've seen before include "Tedious, tiring" , "pestilential" , "Boring" , "Trying" , "Vexatious" .)