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involuntary

[in-vol-uh n-ter-ee] /ɪnˈvɒl ənˌtɛr i/
adjective
1.
not voluntary; independent of one's will; not by one's own choice:
an involuntary listener; involuntary servitude.
2.
unintentional; unconscious:
an involuntary gesture.
3.
Physiology. acting independently of or done or occurring without volition:
involuntary muscles.
Origin
1525-1535
1525-35; < Late Latin involuntārius. See in-3, voluntary
Related forms
involuntarily
[in-vol-uh n-ter-uh-lee, -vol-uh n-tair-] /ɪnˈvɒl ənˌtɛr ə li, -ˌvɒl ənˈtɛər-/ (Show IPA),
adverb
involuntariness, noun
Synonyms
1, 3. See automatic. 2. instinctive. 3. reflex, uncontrolled.
Antonyms
2. intentional.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in voluntarily

involuntary

/ɪnˈvɒləntərɪ; -trɪ/
adjective
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
Derived Forms
involuntarily, adverb
involuntariness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for in voluntarily

involuntary

adj.

mid-15c., from Late Latin involuntarius "involuntary," from in- "not, opposite of" (see in- (1)) + Latin voluntarius (see voluntary). Related: Involuntarily.

Online Etymology Dictionary, © 2010 Douglas Harper
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in voluntarily in Medicine

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

  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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in voluntarily in Science
involuntary
  (ĭn-vŏl'ən-těr'ē)   
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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