Ignorant, stupid (8)
I believe the answer is:
clueless
I believe this is a double definition.
'ignorant' is the first definition.
(I've seen this before)
'stupid' is the second definition.
(I've seen this before)
(Other definitions for clueless that I've seen before include "Stupid (so unable to do crossword?)" , "Stupid (unlike crosswords!)" , "Completely at sea about what's going on" , "sort of crossword that nobody can solve?" , "Lacking knowledge and ability (informal)" .)