How to say "further" in Japanese

• もっとJLPT N5approx.Common
  adverbCovers 'further' as an adverb of degree, where it simply means 'more': study further, go further, investigate further. The straightforward choice whenever 'further' could be replaced by 'more'.
  あなたはもっと理性的りせいてきであるべきだ。↗

  You should be more reasonable.
• 一段いちだんJLPT N2approx.Common
  adverb (with と), no-adjectiveFrames 'further' as a distinct step up in degree — 'even more', 'still more', 'much more' — rather than a small extra amount; choose it when something rises to a noticeably higher level.
  花嫁姿はなよめすがたの彼女かのじょは一段いちだんと美うつくしかった。↗

  She was all the more beautiful dressed in her wedding costume.
• 進めるすすめるJLPT N3approx.Common
  ichidan verb, transitive verbThis is the verb 'to further': to advance something, carry it forward, help it make progress. Use it for furthering plans, work, or a project — not for the adverb 'further'.
  その計画けいかくは進すすめられている。↗

  The project is underway.
• なおJLPT N1approx.Common
  adverbMeans 'still more' or 'greater' — 'further' as a continuation beyond what has come before. Note that it is usually written in kana alone rather than with kanji.
  僕ぼくは君きみが欠点けってんを持もっているので、なおいっそう愛あいしてる。↗

  I love you all the more for your faults.

For 'further' as an adverb of degree use 「もっと」, or 一段 when the increase is a marked step up; 「なお」 adds a 'still more' continuation, and 「進める」 is only for the verb 'to further' something.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• もっと(some) more
• 一段いちだんeven more
• さらなるeven more
• それ以上それいじょうfurther
• なお一層なおいっそうfurther
• この上このうえ(any) more
• この上ともこのうえともfrom now on
• なおもstill (continuing)
• なおまたbesides
• その他にそのほかにelse
• より一層よりいっそうstill more
• もうfurther
• 進めるすすめるto carry forward (plans, work, etc.)
• なおmore
• もfurther