involuntary

From in- +‎ voluntary, from Late Latin involontarius, from in + volontarius.

• (General American) IPA^(key): /ɪnˈvɑl.ənˌtɛ.ɹi/
• (Received Pronunciation) IPA^(key): /ɪnˈvɒl.ən.tɹi/

• Audio (Southern England):

  (file)

• Hyphenation: in‧vol‧un‧ta‧ry

involuntary (comparative more involuntary, superlative most involuntary)

1. Without intention; unintentional.
2. Not voluntary or willing; contrary or opposed to explicit will or desire; unwilling.

   He found himself the involuntary witness in the trial.

• (without intention): inadvertent, unintended; see also Thesaurus:unintentional
• (not voluntary): unbewised, unvoluntary; see also Thesaurus:compulsory

• involuntary manslaughter

• volunteer

• “involuntary”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.
• “involuntary”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.