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Glite Dictionary
to act involuntarily

to act involuntarily

6.5
Do something without meaning to or being in control
  • phrasal verb
translation icon : actuar involuntariamente
  • When startled, people sometimes act involuntarily and drop what they are holding.

Examples

  • The patient may act involuntarily due to a neurological disorder.

  • Don't act involuntarily!

  • During a sneeze, your body acts involuntarily to expel irritants from the nose.

  • He tends to act involuntarily when startled.

  • When startled, the dog will act involuntarily and run away.

  • During the reflex test, the doctor noticed how the patient acted involuntarily when his knee was struck.

  • She might act involuntarily if someone surprises her unexpectedly.

Synonyms

to act reflexively
vsto act involuntarily
6.3

React quickly without thinking

happens without intention or control and not only as a response

Antonyms

voluntarily
165 3.4

You do something by choice, not because someone forces you

Surface Forms

act involuntarily infinitive
acted involuntarily past
acted involuntarily past participle
acting involuntarily present participle
acts involuntarily third person singular

Morphology

act + involuntarily

The meaning 'to behave or perform an action without conscious control' is directly and compositionally derived from 'act' (to do something) + 'involuntarily' (without deliberate choice or control). This is a straightforward verb + adverb construction that follows normal English composition patterns and has clear equivalents in many languages, so a B1 learner who knows the two constituents should understand it.

Etymology

The phrase act involuntarily comes from the simple image of the body doing something on its own, like a sudden sneeze or the knee-jerk when a doctor taps your leg, where you do not decide to act and the movement is involuntary. So, act involuntarily means 'to behave without thinking'.