反応する · noun or participle which takes 'suru'
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 反応する | 反応しない |
| Polite | 反応します | 反応しません |
| Past polite | 反応しました | 反応しませんでした |
| Past | 反応した | 反応しなかった |
| Te-form | 反応して | 反応しないで |
| Desire | 反応したい | 反応したくない |
| Potential | 反応できる | 反応できない |
| Passive | 反応される | 反応されない |
| Causative | 反応させる | 反応させない |
| Causative passive | 反応させられる | 反応させられない |
| Volitional | 反応しよう | |
| Polite volitional | 反応しましょう | |
| Imperative | 反応しろ | 反応するな |
| Conditional | 反応すれば | 反応しなければ |
| Tara conditional | 反応したら | 反応しなかったら |
noun, noun or participle which takes 'suru', intransitive verb
General term for a response to an action, statement, or event. Covers emotional, verbal, and behavioral reactions.
No one reacted to his joke.
The public's reaction to the news was mixed.
noun, noun or participle which takes 'suru', intransitive verb
physical response; physiological reaction
Used for observable biological or physical responses to stimuli, such as reflexes, sensory reactions, or organism-level responses.
The pupil contracts in response to light.
We are investigating the body's reaction to this drug.
noun, noun or participle which takes 'suru', intransitive verb
chemical reaction
Technical term in chemistry for a process where substances interact and change. Often used in compounds like 化学反応 (chemical reaction).
Iron reacts with oxygen and rusts.
This chemical reaction produces heat.
He didn't react to the news.
The patient showed a reaction to the medicine.
He reacts quickly.
Acid reacts with alkali.
This medicine can trigger an allergic reaction.
反応 is the general, native Sino-Japanese word for any reaction (physical, chemical, emotional, or social), while リアクション leans casual and often highlights how the response looks or feels in social situations.
反応 emphasizes an instinctive or physical reaction (even non-verbal), whereas レスポンス usually implies a communicative or deliberate reply.
反応 is the general term for any chemical reaction (including decomposition or substitution), while 化合 refers specifically to two or more substances combining into one new substance.
反応 is the broader word for any response (physical, chemical, or emotional), while 反作用 specifically denotes an opposing or counter-effect, often in physics.
反応 is a neutral response to a stimulus, whereas 反動 implies a counter-movement pushing back against a prior force or trend.
反応 is a simple reaction to a stimulus, while 呼応 implies a mutual, matched response between two parties or elements.
reactivity
reactor; reacting furnace