疲労する · noun or participle which takes 'suru'
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 疲労する | 疲労しない |
| Polite | 疲労します | 疲労しません |
| Past polite | 疲労しました | 疲労しませんでした |
| Past | 疲労した | 疲労しなかった |
| Te-form | 疲労して | 疲労しないで |
| Desire | 疲労したい | 疲労したくない |
| Potential | 疲労できる | 疲労できない |
| Passive | 疲労される | 疲労されない |
| Causative | 疲労させる | 疲労させない |
| Causative passive | 疲労させられる | 疲労させられない |
| Volitional | 疲労しよう | |
| Polite volitional | 疲労しましょう | |
| Imperative | 疲労しろ | 疲労するな |
| Conditional | 疲労すれば | 疲労しなければ |
| Tara conditional | 疲労したら | 疲労しなかったら |
noun, noun or participle which takes 'suru', intransitive verb
fatigue; weariness; exhaustion
General physical or mental tiredness. Used as a noun or with する to mean 'become fatigued'.
Fatigue built up from driving for a long time.
He is severely fatigued from overwork.
noun, noun or participle which takes 'suru', intransitive verb
metal fatigue
Technical term for material fatigue, especially in metals. Used in engineering contexts.
The bridge collapsed due to metal fatigue.
My fatigue built up and my concentration dropped.
This part suffers fatigue from repeated vibration.
I feel fatigued from working long hours.
He collapsed from fatigue and was taken to the hospital.
Even after a night's sleep, my fatigue doesn't go away.
疲労する is a more formal, technical word than 疲れる, often used in medical, sports, or written contexts to describe accumulated fatigue.
疲労 is ordinary physical tiredness, while 疲弊 is a stronger, more formal word for severe or prolonged exhaustion.
feeling of fatigue; tiredness; fatigability
institutional fatigue; systemic fatigue