adverb
absolutely not; not at all
Rare emphatic negative adverb, always followed by a negative verb form. Related to 根っから (ねっから), which also means 'completely (not)'.
See also: 根っから
彼の言い訳は根っから葉っから信じられない。
I can't believe his excuse at all.
あの話は根っから葉っから嘘だ。
That story is an absolute lie.