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involuntary 
involuntary definition
in·vol·un·tary (in väl′ən ter′ē)
adjective
not voluntary; specif.,
- not done of one's own free will; not done by choice
- unintentional; accidental
- not consciously controlled; automatic sneezing is involuntary
Etymology: LL involuntarius
Related Forms:
- involuntarily in·vol′·un·tar′i·ly adverb
- involuntariness in·vol′·un·tar′i·ness noun
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