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involuntary

adjective
 
 
/ɪnˈvɒl.ən.tər.i/ US  /-ˈvɑː.lən.ter.i/

Definition

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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