Simple Definition of involuntary
: not done or made consciously
: not done by choice
Examples of involuntary
Breathing and circulation are involuntary processes.
When the door burst open, she let out an involuntary shriek.
The lawyer argued that the client's confession was involuntary.
Origin of involuntary
Middle English involuntari, from Late Latin involuntarius, from Latin in- + voluntarius voluntary
First Known Use: 15th century
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