Without knowledge; unaware (8)
I believe the answer is:
ignorant
I believe this is a double definition.
'without knowledge' is the first definition.
(I've seen this before)
'unaware' is the second definition.
(I've seen this before)
(Other definitions for ignorant that I've seen before include "Unknowing" , "Empty-headed" , "Lacking in or good manners" , "Unlearned, lacking knowledge" , "No rating for being uninformed" .)