Abnormal, insincere (9)
I believe the answer is:
unnatural
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">abnormal</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that abnormal can be written as unnatural)</span><br/ ><br/ >'<span class="explanation-format__original">insincere</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for unnatural that I've seen before include "Strange" , "Annual rut may be abnormal" , "Freakish" , "Abnormal; not spontaneous" , "Lacking normal feelings of, say, affection" .)