全然
ぜんぜんNot at all; entirely
N4adverb·zenzen
How to remember it
全 (all) + 然 (state) — the whole state, often negated to 'not at all.'
Example sentences
全然わかりません。
ぜんぜんわかりません。
I don't understand at all.
全然問題ありません。
ぜんぜんもんだいありません。
There's no problem at all.
Usage
Traditionally with negatives ('not at all'); casual speech also affirms ('totally').
Related words
全く少しも大丈夫あまり