Adjective
Involuntary.
Source: Webster's dictionaryAction men are the unvoluntary slaves of wise men. Fernando Pessoa
involuntary manslaughter Source: Internet
involuntary servitude Source: Internet
an involuntary shudder Source: Internet
It (becoming a hero) was involuntary. They sank my boat Source: Internet
Because of the urges that precede them, tics are described as semi-voluntary or "unvoluntary", rather than specifically involuntary; they may be experienced as a voluntary, suppressible response to the unwanted premonitory urge. Source: Internet