/ ɪnˈvɒləntri; NAmE ɪnˈvɑːlənteri/ adjective
1.
an involuntary movement, etc. is made suddenly, without you intending it or being able to control it :
an involuntary cry of pain
OPP voluntary
2.
happening without the person concerned wanting it to :
the involuntary repatriation of immigrants
involuntary childlessness
► in·vol·un·tar·ily / ɪnˈvɒləntrəli; NAmE ɪnˌvɑːlənˈterəli/ adverb