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English definition of “involuntary”

involuntary

adjective uk   /ɪnˈvɒl.ən.tər.i/ us    /-ˈvɑː.lən.ter.i/
not done by choice; done unwillingly, or without the decision or intention of the person involved: A sharp tap on the knee usually causes an involuntary movement of the lower leg.
involuntarily
adverb uk   /-ˈter.əl.i/ us  
Arthur shivered involuntarily as he came out of the building.
(Definition of involuntary from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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