How to say "degradation" in Japanese

Choosing the right word
  • 劣化れっかCommon
    noun, suru verb, intransitive verbUse this for degradation as the gradual worsening of quality or performance — materials, machinery, skills — when something works or looks worse than before.
  • 堕落だらくCommon
    noun, suru verb, intransitive verbDegradation in the moral sense: a person falling into depravity or corruption. Use it when someone's character or conduct degenerates, not for objects or performance.
    彼かれは道徳的どうとくてきに堕落だらくした。↗
    He lapsed morally.
  • 低下ていかJLPT N2approx.Common
    noun, suru verb, intransitive verbA fall or decline: levels of ability, efficiency, or standards dropping lower. Choose it when 'degradation' means a drop to a lower level rather than decay of quality or morals.
    たしかに出生率しゅっしょうりつの低下ていかで子供こどもの数かずが減へり、学校がっこうでも生徒せいとの数かずが少すくなくなっているのは事実じじつですが、しかし、これはまったくもってけっこうなことです。↗
    It's true that there are fewer children due to the falling birthrate, and there are fewer children in the school, but that is all to the good.
  • 左遷させんCommon
    noun, suru verb, transitive verbHere 'degradation' means reduction in rank: a person being demoted or relegated to a lesser post. It applies to people's positions, not to quality, morals, or materials.
  • 分解ぶんかいJLPT N2approx.Common
    noun, suru verb, transitive verb, intransitive verbCovers degradation as decomposition: a substance breaking down or disintegrating, as in chemistry. For most other senses of 'degradation' this is not the word you want.
    水みずは酸素さんそと水素すいそに分解ぶんかいできる。↗
    Water can be decomposed into oxygen and hydrogen.

Match the sense: 劣化 for quality or performance worsening, 低下 for a drop in level, 堕落 for moral degradation, 左遷 for reduction in rank, and 分解 for chemical decomposition.

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

Japanese equivalents
  • 劣化れっかdeterioration (in quality, performance, etc.)
  • 堕落だらくdepravity
  • 低下ていかfall
  • 左遷させんdemotion
  • 降職こうしょくdegradation
  • 不良化ふりょうかdegradation
  • 降級こうきゅうdowngrading
  • 壊乱かいらんcorruption (of order, public morals, etc.)
  • 堕落腐敗だらくふはいdebasement
  • 腐敗堕落ふはいだらくdebasement
  • 崩解ほうかいdisintegration
  • 削剥作用さくはくさようdenudation
  • 分解ぶんかいdecomposition
  • 転落てんらくfall (in position, standing, etc.)
  • 縮退しゅくたいdegradation (CPU, memory, etc.)
See also

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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