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English definition of “involuntary”

involuntary

adjective    /ɪnˈvɑl·ənˌter·i/
not done willingly, or not done intentionally: A sharp tap beneath the knee usually causes an involuntary movement of the lower leg. The driver of the vehicle was charged with involuntary manslaughter.
(Definition of involuntary adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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