衰える|おとろえるotoroeru[4]nakadaka (mid-high)
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- ichidan verb, intransitive verbto become weak; to decline; to wear; to abate; to decay; to wither; to waste away
Conjugation
| Dictionary form | 衰える(おとろえる) |
|---|---|
| Polite (masu) | 衰えます(おとろえます) |
| Negative (nai) | 衰えない(おとろえない) |
| polite (masen) | 衰えません(おとろえません) |
| classical zu / nu | 衰えず・衰えぬ(おとろえず・おとろえぬ) |
| Past (ta) | 衰えた(おとろえた) |
| polite (mashita) | 衰えました(おとろえました) |
| Past negative (nakatta) | 衰えなかった(おとろえなかった) |
| polite (masen deshita) | 衰えませんでした(おとろえませんでした) |
| Te form | 衰えて(おとろえて) |
| Potential | 衰えられる(おとろえられる) |
| Passive | 衰えられる(おとろえられる) |
| Causative | 衰えさせる(おとろえさせる) |
| Causative passive | 衰えさせられる(おとろえさせられる) |
| Conditional (ba) | 衰えれば(おとろえれば) |
| tara | 衰えたら(おとろえたら) |
| Volitional | 衰えよう(おとろえよう) |
| polite (mashou) | 衰えましょう(おとろえましょう) |
| Imperative | 衰えろ(おとろえろ) |
Common forms generated by rule; see the senses for honorific or irregular usage.
- Synonym弱まるよわまるNeutralUsed when wind, rain, momentum or intensity weakens, as in 「風が弱まる」; 「衰える」 centers on strength or power declining from its prime.
- Synonym弱るよわるNeutralCovers being physically frail and also being troubled or at a loss; 「衰える」 focuses on strength or power declining from its peak.
- Synonym減衰げんすいWrittenWritten/formal prose and a physics term: signals or vibrations fading away; 「衰える」 is about physical strength and power.
- Synonym萎えるなえるNeutralCovers strength or drive draining away and plants wilting, as in 「気力が萎える」; 「衰える」 stresses decline from a former peak.
- Synonym衰微すいびWrittenWritten/formal prose for the decline of a nation or family; 「衰える」 is more colloquial.
- Synonym衰耗すいもうWrittenWritten/formal prose and rare: weakening and wearing away; in everyday speech say 「衰える」.
- Related衰退すいたいNeutralA Sino-Japanese noun for the decline of power or industries, as in 「産業の衰退」; also 「衰退する」. 「衰える」 is more colloquial.
- Related低下ていかNeutralFor ability or quality dropping, as in 「視力低下」; 「衰える」 pictures an overall decline from a peak.
- Related減退げんたいNeutralUsed for appetite or memory fading; 「衰える」 is about overall decline.
- Related凋落ちょうらくWrittenWritten/formal prose for prosperity fading into downfall; 「衰える」 is the broader, more general word.
- Antonym栄えるさかえるNeutralAntonym on the rise-and-fall axis: prospering and flourishing, the opposite of 「衰える」's decline.
- Antonym盛るさかるNeutralAntonym on the rise-and-fall axis: growing vigorous and thriving, the opposite of 「衰える」's decline.
- Antonym隆盛するWrittenWritten/formal-prose antonym on the rise-and-fall axis: prosperity and flourishing, opposite 「衰える」.
Use 「衰える」 for strength, power or popularity fading from a peak, as in 「体力が衰える」. Pick 「弱まる」 for wind or momentum easing, 「弱る」 for frailty or being at a loss, 「低下」 for falling ability, 「萎える」 for lost drive, 「減退」 for appetite or memory, 「衰退」 for industries. 減衰, 衰微, 衰耗 and 凋落 are written/formal prose; the opposites are 「栄える」, 「盛る」 and 「隆盛する」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
- 力などが弱くなる。


