可能形 => Potential form N4
全く~ない => not at all ~ N3
全然~ない => (not) at all N4
[可能系「かのうけい」] => Can, be able to, be possible to N4
Can, Should, Must
[全「まった」]く~ない => Not A (at all; even a little bit) N3
Not only, Not even