Rudeness, insolence (12)
I believe the answer is:
impertinence
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">rudeness</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that impertinence is a type of rudeness)</span><br/ ><br/ >'<span class="explanation-format__original">insolence</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for impertinence that I've seen before include "Rudeness" , "Lack of respect" , "Insolence" , "cheek or lip" , "Disrespectful behaviour" .)