Unsure, not confident (9)
I believe the answer is:
uncertain
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">unsure</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that unsure can be written as uncertain)</span><br/ ><br/ >'<span class="explanation-format__original">not confident</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for uncertain that I've seen before include "in the lap of the gods" , "Not at all sure or decided" , "Not convinced" , "Not completely confident or sure of" , "Not definitely known" .)