Why do many adverbs end with ず?

Question

A quick search on jisho.org reveals that many of the first page results of words that end with a ず are adverbs. So this type of adverb is common.
In fact, it's true (at least for these first page results) that a word is an adverb if and only if the final ず is written in kana instead of being part of the reading of a kanji.
This doesn't seem like a coincidence.
I know that ず was historically a negative conjugation (per this question), but I can't really why that would make it a common adverb ending.
Does anyone know why this might be the case?

Keisuke · Answer

I don't think so many adverbs with ず in Japanese adverbs but I find some examples of Japanese adverbs with "ず" at the end of a word are;
Group A: ず means negative conjugation
あいかわらず (as not changed)
あしからず (do not treat it as bad thing)
おもいがけず (as not supposed)
おもわず (as not supposed)
Group B: ず is a part of Mimetic word
うずうず (itchy)
ぐずぐず (tardily)
Adverbs are changed shape of verb.
Above Group A is changed with negative form of verbs.

Why do many adverbs end with ず?

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