Disparaging, abusive (10)
I believe the answer is:
scurrilous
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">disparaging</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">abusive</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that abusive can be written as scurrilous)</span><br/ ><br/ ></span>
(Other definitions for scurrilous that I've seen before include "Obscenely slanderous" , "Scandalously damaging" , "Humorously insulting" , "Unjustifiably defamatory" , "Grossly insulting" .)