Lacking intelligence (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lacking intelligence</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for stupid that I've seen before include "Not intelligent, thick" , "Asinine" , "Not sensible or intelligent" , "dope" , "Barmy" .)
(Other definitions for witless that I've seen before include "Out of one's mind (maybe scared)" , "Lacking sense, understanding or judgment" , "Foolish, stupid" , "Daft" .)