Not at all with 全然~ない

The adverb 全然(ぜんぜん) followed by a negative verb or adjective gives the meaning “not at all”, such as “do not understand at all” or “am not happy at all”.

Examples

Is the Order a Rabbit? » Volume 1 » Page 106 (Right) » Panel 3

Panel 3

全然(ぜんぜん)わからない

During an underwater-breath-holding contest, Cocoa begins a game a charades. Syaro doesn’t understand at all what the gestures are supposed to mean.