全く~ない => not at all ~ N3
全然~ない => (not) at all N4
のを知っていますか => Do you know...? N4
かも[知「し」]れない => Might A, maybe A, perhaps A N3
Sentence Endings
[全「まった」]く~ない => Not A (at all; even a little bit) N3
Not only, Not even