See also: すい


Etymology 1Edit

Unknown. Possibly from (zui, bone marrow); compare the sense development that led to the senses “something straight; an exact direction, an immediate area” for reading (zun).

First appears in the early 1500s.[1]



ずい (zui

  1. straightforwardly, wholeheartedly, unreservedly, directly, immediately, all at once, in one go
    Synonym: 一気 (ikki)
Usage notesEdit

Used with the adverbial particle (to).

  • ずいと(ある)()
    zui to arukidasu
    to set forth [walking] without reservation

Not to be confused with adverb 惴惴 (zuizui, in a manner quaking with fear).


ずい (zui-

  1. (archaic) exactly that, directly or immediately that
Usage notesEdit

Attaches to nouns or verbs.

In popular use during the late 1700s.[1]

Etymology 2Edit

Any of various on'yomi terms.

For pronunciation and definitions of ずい – see the following entry.
[noun] bone marrow
[noun] the pith of a plant
[noun] (figurative) the pith or essence of something, such as a skill or cultural thing
(This term, ずい, is an alternative spelling of the above Sino-Japanese term.
For a list of all kanji read as ずい, not just those used in Japanese terms, see Category:Japanese kanji read as ずい.)

(The following entries are uncreated: , , , , .)


  1. 1.0 1.1 1988, 国語大辞典(新装版) (Kokugo Dai Jiten, Revised Edition) (in Japanese), Tōkyō: Shogakukan
  2. 2.0 2.1 2006, 大辞林 (Daijirin), Third Edition (in Japanese), Tōkyō: Sanseidō, →ISBN