INVOLUNTARY
involuntary, nonvoluntary, unvoluntary
(adjective) not subject to the control of the will; “involuntary manslaughter”; “involuntary servitude”; “an involuntary shudder”; “It (becoming a hero) was involuntary. They sank my boat”- John F.Kennedy
involuntary
(adjective) controlled by the autonomic nervous system; without conscious control; “involuntary muscles”; “gave an involuntary start”
Source: WordNet® 3.1
Etymology
Adjective
involuntary (comparative more involuntary, superlative most involuntary)
Without intention; unintentional.
Not voluntary or willing; contrary or opposed to explicit will or desire; unwilling.
Synonyms
• (without intention): inadvertent, unintended; see also unintentional
• (not voluntary): unbewised, unvoluntary; see also compulsory
Source: Wiktionary
In*vol"un*ta*ry, a. Etym: [L. involuntarius. See In- not, and
Voluntary.]
1. Not having will of the power of choice.
2. Not under the influence or control of the will; not voluntary; as,
the involuntary movements of the body; involuntary muscle fibers.
3. Not proceeding from choice; done unwillingly; reluctant;
compulsory; as, involuntary submission.
Source: Webster’s Unabridged Dictionary 1913 Edition