noun, noun which may take the genitive case particle 'no'
Used as a noun or with の to mean 'all of something' or 'the entirety'. Often appears in formal or emphatic contexts.
一切の責任は私にあります。
All responsibility lies with me.
彼は一
He lost all of his property.
adverb
absolutely (not); (not) at all; (none) whatsoever
Used adverbially with a negative verb to mean 'not at all' or 'absolutely not'. Stronger than 全然.
彼は一切お酒を飲まない。
He doesn't drink alcohol at all.
その件については一切知りません。
I know absolutely nothing about that matter.