Using double negative


Would appreciate if someone helped me understand the following word patterns
with examples:

> **なかなか** 〜ない  
>  **ほとんど** 〜ない  
>  **ぜんぜん** 〜ない

Can any of them be used in a positive context too?




「ぜんぜん大丈夫【だいじょうぶ】」 is frequently used to mean "Completely OK" in a positive
context. It may not conform to strict Japanese grammar instruction, but it is
widely used by multiple generations of Japanese people.

