劣化|れっかrekka[0]heiban (flat)
This browser can't play pronunciations (needs Safari 18.4 or later, or Chrome / Edge / Firefox).
- noun, suru verb, intransitive verbdeterioration (in quality, performance, etc.); degradation; worsening
- noun, suru verb, intransitive verb(visible) aging; becoming unattractive (due to aging)
Conjugation
| Dictionary form | 劣化する(れっかする) |
|---|---|
| Polite (masu) | 劣化します(れっかします) |
| Negative (nai) | 劣化しない(れっかしない) |
| polite (masen) | 劣化しません(れっかしません) |
| classical zu / nu | 劣化せず・劣化せぬ(れっかせず・れっかせぬ) |
| Past (ta) | 劣化した(れっかした) |
| polite (mashita) | 劣化しました(れっかしました) |
| Past negative (nakatta) | 劣化しなかった(れっかしなかった) |
| polite (masen deshita) | 劣化しませんでした(れっかしませんでした) |
| Te form | 劣化して(れっかして) |
| Potential | 劣化できる(れっかできる) |
| Passive | 劣化される(れっかされる) |
| Causative | 劣化させる(れっかさせる) |
| Causative passive | 劣化させられる(れっかさせられる) |
| Conditional (ba) | 劣化すれば(れっかすれば) |
| tara | 劣化したら(れっかしたら) |
| Volitional | 劣化しよう(れっかしよう) |
| polite (mashou) | 劣化しましょう(れっかしましょう) |
| Imperative | 劣化しろ(れっかしろ) |
Common forms generated by rule; see the senses for honorific or irregular usage.
- Synonym低下ていかNeutralRefers to a level or degree dropping, as in 「視力低下」; 「劣化」 is about a material's quality or performance wearing down over time.
- Synonym悪化あっかNeutralDescribes a situation getting worse, as in 「病状悪化」; 「劣化」 is used when an object's quality or performance declines.
- Antonym向上こうじょうNeutralMeans improvement or advancement; it is the opposite of 「劣化」 in the sense of getting better rather than worse.
- AntonymかいぜんNeutralMeans making something better or fixing what is wrong; the opposite of 「劣化」 in the better-versus-worse direction.
- Antonym進歩しんぽNeutralMeans progress or development; it stands opposite to 「劣化」 as advancing versus degrading.
- Antonym強化きょうかNeutralMeans strengthening or reinforcing; the opposite of 「劣化」 in making something stronger rather than weaker.
Use 「劣化」 when a material's quality or performance worsens over time, as in 「経年劣化」 or 「電池の劣化」. For a level dropping use 「低下」, for a situation worsening 「悪化」; the opposites are 「向上」, 「改善」 and 「強化」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


