Unbearable (11)
I believe the answer is:
intolerable
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unbearable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for intolerable that I've seen before include "The last straw" , "Unable to be endured" , "Unbearable" .)