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Ic Il Im In Ip Ir Is It
Inc Ind Inf Ing Inh Inn Ino Ins Int Inv

Involuntary

/inˈvälənˌterē/

Adjective

1. One that occurs without volition or will. (wikipedia.org)

2. Done without conscious control. (Google Dictionary)

3. Without intention; unintentional. (wiktionary.org)

4. (esp. of muscles or nerves) Concerned in bodily processes that are not under the control of the will. (Google Dictionary)

5. Controlled by the autonomic nervous system; without conscious control. (wordnetweb.princeton.edu)

Word origin: From Late Latin involuntarius “involuntary,” from in– “not, opposite of”