Disbelieving (11)
I believe the answer is:
incredulous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">disbelieving</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for incredulous that I've seen before include "Unwilling to believe something" , "Sceptical, unbelieving" , "Unable to believe something" .)