Questionable; doubtful (13)
I believe the answer is:
problematical
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">questionable</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">doubtful</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for problematical that I've seen before include "Difficult; doubtful" , "Open to doubt or debate" , "Presenting difficulties" , "Dubious" .)