ぜんぜん全然zenzen
1.
A term that communicates a complete or total denial, often used in conjunction with negative expressions to indicate that something is entirely absent or lacking.
2.
A word occasionally used in casual speech to emphasize a high degree or extent of something, expressing that it is exceptionally true or significant.
3.
An expression that conveys the feeling of being entirely untroubled or unconcerned about a situation, often dismissing any negative implications.
Example:
「長い1日だったのでお疲れでしょう」「いいえ、全然」