Rude or knowing very little (8)
I believe the answer is:
ignorant
I believe this is a double definition.
'rude' is the first definition.
(I've seen this before)
'knowing very little' is the second definition.
(I've seen this before)
(Other definitions for ignorant that I've seen before include "Unenlightened" , "No rating for being uninformed" , "Ill-educated" , "Lacking in or good manners" , "Without knowledge" .)