not voluntary; independent of one's will; not by one's own choice: an involuntary listener; involuntary servitude.
unintentional; unconscious: an involuntary gesture.
Physiology. acting independently of or done or occurring without volition: involuntary muscles.

1525–35; < Late Latin involuntārius. See in-3, voluntary

involuntarily [in-vol-uhn-ter-uh-lee, -vol-uhn-tair-] , adverb
involuntariness, noun

1, 3. See automatic. 2. instinctive. 3. reflex, uncontrolled.

2. intentional. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
involuntary (ɪnˈvɒləntərɪ, -trɪ)
1.  carried out without one's conscious wishes; not voluntary; unintentional
2.  physiol (esp of a movement or muscle) performed or acting without conscious control

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1531, from L.L. involuntarius "involuntary," from in- "not" + L. voluntarius (see voluntary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

involuntary in·vol·un·tar·y (ĭn-vŏl'ən-těr'ē)

  1. Not subject to control of the volition.

  2. Acting or done without or against one's will.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
involuntary   (ĭn-vŏl'ən-těr'ē)  Pronunciation Key 
Not under conscious control. Most of the biological processes in animals that are vital to life, such as contraction of the heart, blood flow, breathing, and digestion, are involuntary and controlled by the autonomic nervous system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The involuntary eye movements of nystagmus are caused by abnormal function in
  the areas of the brain that control eye movements.
First, let's consider involuntary collaboration with jerks.
Government offices are closed on some days, as state workers take involuntary
  and unpaid furloughs.
However, some migrations are forced and involuntary.
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