Meaning & Definition
adjective
Not done by choice; without intention or control.
His involuntary reaction to the loud noise startled everyone in the room.
Occurring without voluntary control, such as certain bodily functions.
Breathing is an involuntary function that continues even during sleep.
Not being able to act according to one's own will.
She gave an involuntary shudder as the chilly wind passed by.
Relating to actions or movements that are reflexive rather than deliberate.
The patient's involuntary movements were a result of the neurological disorder.
Etymology
From Latin involuntarius, meaning 'not willing, unintentional'.
Common Phrases and Expressions
involuntary manslaughter:
The unlawful killing of a person without malice aforethought, often as a result of negligence.
involuntary commitment:
The process of admitting an individual to a mental health facility against their will.
involuntary muscle:
Muscle that is not under conscious control, such as the heart muscle.
Slang Meanings
Unintentional reaction.
Her jump at the surprise party was totally involuntary.
A reflex action.
That flinch was an involuntary response, not something I meant to do.