Impalpable (10)
I believe the answer is:
intangible
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impalpable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that impalpable can be written as intangible)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for intangible that I've seen before include "Elusive" , "Abstract - hard to grasp" , "unclear" .)