Obstinacy, stubbornness (13)
I believe the answer is:
intransigence
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">obstinacy</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that intransigence is a type of obstinacy)</span><br/ ><br/ >'<span class="explanation-format__original">stubbornness</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that intransigence is a type of stubbornness)</span><br/ ><br/ ></span>
(Other definitions for intransigence that I've seen before include "Obstinacy" , "lack of flexibility" , "pigheadedness" , "Refusal to change one's opinions" , "Stubborn refusal to compromise" .)