老衰する · noun or participle which takes 'suru'
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 老衰する | 老衰しない |
| Polite | 老衰します | 老衰しません |
| Past polite | 老衰しました | 老衰しませんでした |
| Past | 老衰した | 老衰しなかった |
| Te-form | 老衰して | 老衰しないで |
| Desire | 老衰したい | 老衰したくない |
| Potential | 老衰できる | 老衰できない |
| Passive | 老衰される | 老衰されない |
| Causative | 老衰させる | 老衰させない |
| Causative passive | 老衰させられる | 老衰させられない |
| Volitional | 老衰しよう | |
| Polite volitional | 老衰しましょう | |
| Imperative | 老衰しろ | 老衰するな |
| Conditional | 老衰すれば | 老衰しなければ |
| Tara conditional | 老衰したら | 老衰しなかったら |
noun, noun or participle which takes 'suru', intransitive verb, noun which may take the genitive case particle 'no'
senility; senile decay; infirmity of old age
Refers to the physical and mental decline due to advanced age. Often used in medical or formal contexts, but also in everyday speech. Can be used as a noun, with する to mean 'become senile', or as a no-adjective.
My grandfather died of old age.
His senility has progressed, and lately he no longer recognizes his family's faces.
My grandfather passed away of old age.
It seems my mother's senility has been progressing lately.