Translation guide
Describes actions, reactions, or states that occur without conscious control or will. Covers physiological reflexes, automatic responses, and things done against one's will.
Reflexes, automatic bodily functions, or reactions that happen without thinking.
The standard medical/biological term for involuntary bodily functions or movements. Often used in formal or technical contexts.
Involuntary movements can occur due to nervous system abnormalities.
Describes a reflexive, automatic reaction. Common in everyday speech for quick, unthinking responses.
Adverb meaning 'without thinking', 'spontaneously', or 'involuntarily' in the sense of an automatic reaction. Very common in casual and spoken Japanese.
Adverb for doing something unintentionally or against one's better judgment, often out of habit. Implies a slight lack of control.
Actions forced upon someone, not by their own choice.
Means 'unwilling' or 'reluctant'. Often used in phrases like 不本意ながら (against one's will).
I had no choice but to accept the proposal involuntarily.
Literally 'contrary to one's will'. Used when something happens against someone's wishes.
Means 'having no choice', 'reluctantly'. Implies doing something involuntarily due to circumstances.
Thoughts, memories, or emotions that arise without conscious effort.
Both mean 'involuntarily', but 思わず emphasizes a spontaneous reaction to a stimulus, while つい implies doing something out of habit or weakness, often with a sense of regret.
I stood up involuntarily from surprise.
I involuntarily ate too much (out of habit).
Directly translating 'involuntary' as 不随意 in everyday conversation can sound overly technical. Use adverbs like 思わず or 自然に for natural expressions.
She let out an involuntary gasp.
熱いものに触ると、反射的に手を引っ込める。
When you touch something hot, you pull your hand back involuntarily.
あまりに驚いて、思わず叫んでしまった。
I was so surprised that I screamed involuntarily.
Even though I'm on a diet, I end up eating sweets involuntarily.
He took on the position involuntarily, against his will.
雨が降ってきたので、仕方なくピクニックを中止した。
It started raining, so we involuntarily canceled the picnic.
I had involuntarily developed a bad habit without realizing it.