Unassertive (9)
I believe the answer is:
diffident
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unassertive</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for diffident that I've seen before include "Bashful" , "Reluctant to come forward" , "Shy" , "Lacking self-confidence" , "Timid" .)