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English definition of “involuntary”

involuntary

adjective     /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 .Not expected or planned involuntarily     /-ˈter.əl.i/ adverb Arthur shivered involuntarily as he came out of the building .Not expected or planned
(Definition of involuntary adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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