involuntaryPronunciation: /ɪnˈvɒlənt(ə)ri/Translate involuntary | into German | into Italian | into Spanish Definition of involuntary adjective 1done without will or conscious control:she gave an involuntary shudder (especially of muscles or nerves) concerned in bodily processes that are not under the control of the will. 2done against someone’s will; compulsory:a policy of involuntary repatriationDerivatives involuntarily adverb involuntariness noun Spelling helpSpell involuntary with -ary at the end.involuntary in other Oxford dictionaries Definition of involuntary in the US English dictionary