Not aware (9)
'not aware' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for unknowing that I've seen before include "Lacking awareness" , "Ignorance" , "Not aware" , "Ignorant" .)
(Other definitions for oblivious that I've seen before include "Heedless" , "Unconscious" , "totally in the dark?" , "Apt to forget" , "Not noticing" .)