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In the modern Tokyo dialect, when ず (-zu)Category:Japanese links with redundant alt parameters#ず attaches to the 未(み)然(ぜん)形(けい) (mizenkei, “irrealis or incomplete form”) of a verb, the resulting accent usually follows the accent of the base verb, but exceptions are to be observed:

When attaching to a 平(へい)板(ばん)式(しき) (heiban-shiki) verb, the result is also 平(へい)板(ばん)式(しき) (heiban-shiki):

When attaching to a 起(き)伏(ふく)式(しき) (kifuku-shiki) verb, the result is also 起(き)伏(ふく)式(しき) (kifuku-shiki), with the アクセント核(かく) (akusento-kaku, “accent kernel”) usually falling on the mora before ず (-zu)Category:Japanese links with redundant alt parameters#ず:

For some accented ず (-zu)Category:Japanese links with redundant alt parameters#ず forms, the アクセント核(かく) (akusento-kaku, “accent kernel”) falls on the mora before the mora before the ず (-zu)Category:Japanese links with redundant alt parameters#ず. This is in particular the case for fossilized (lexicalized) adverbials, as opposed to spontaneous suffixation. These exceptional accents are more traditional. In some cases, both accents exist with the exceptional, traditional accent being more strongly associated with the fossilized, adverbial meaning and the regular, modern accent being more strongly associated with the predictable verbal meaning.
Examples of exceptional accents include 非(あら)ず (arazu), 可(べ)からず (bekarazu), 思(おも)わず (omowazu), and 問(と)わず (towazu).
As with せぬ (senu) and せよ (seyo), せず (sezu) is accented even though する (suru)Category:Japanese links with redundant target parameters#ず is not.
Some lexical items such as 恥(はじ)知(し)らず (hajishirazu) may appear to be exceptional when they are not; they get their accent from compounding:
はじCategory:Japanese terms with redundant script codes#ず [hajiꜜ] (Odaka) + しらずCategory:Japanese terms with redundant script codes#ず [shirazu] (Heiban – [0]) → はじしらずCategory:Japanese terms with redundant script codes#ず [hajishiꜜrazu] (Nakadaka)

The kanji spelling 不 attaches to verbs as a prefix in kanbun style, forming jukujikun readings such as 不知(しらず) (shirazu) or 不悪(あしからず) (ashikarazu).

Classical conjugation of "ず" (irregular)
Stem forms
Irrealis (未然形)	ずざらな^[1]	zu zara na
Continuative (連用形)	ず^[2] ざり^[3] に^[1]	zu zari ni
Terminal (終止形)	ずざり	zu zari
Attributive (連体形)	ぬざる	nu zaru
Realis (已然形)	ねざれ	ne zare
Imperative (命令形)	ざれ	zare
Key constructions
Negative		-
Contrasting conjunction	ねどざれど	nedo zaredo
Causal conjunction	ねばざれば	neba zareba
Conditional conjunction	ずはずばざらば	zufa zuba zaraba
Past tense (firsthand knowledge)	ざりき	zariki
Past tense (secondhand knowledge)	ざりけり	zarikeri
Perfect tense (conscious action)	ざりつ	zaritu
Perfect tense (natural event)	ざりぬ^[4]	zarinu
Perfect-continuative tense	ざりたり	zaritari
Adverbial	ず	zu

^[1]Nara period form.
^[2]Without auxiliary verbs.
^[3]With auxiliary verbs.
^[4]Unattested.

For pronunciation and definitions of ず – see the following entries.

【図】2	Category:Japanese nouns#す'Category:Japanese terms with redundant sortkeys#す'Category:Japanese lemmas#す'Category:Japanese hiragana#す' [noun] diagram, figure, illustration

【徒】4	Category:Japanese nouns#す'Category:Japanese terms with redundant sortkeys#す'Category:Japanese lemmas#す'Category:Japanese hiragana#す' [noun] (historical) one of the punishments in the ancient Ritsuryō system; penal servitude

【頭】2	Category:Japanese nouns#す'Category:Japanese terms with redundant sortkeys#す'Category:Japanese lemmas#す'Category:Japanese hiragana#す' [noun] head

【出】1

(This term, ず (zu), is the hiragana spelling of the above terms.)
For a list of all kanji read as ず, see Category:Japanese kanji read as ず.