Reflex
Definition 1 of 4

Involuntary Action
Reflex refers to actions your body does automatically, without you deciding to do them.

Knee-jerk is a common reflex test by doctors.
Not Deliberate
A reflex isn't controlled by conscious thought; it happens instinctively.

Blinking when something approaches your eyes is a reflex.
Quick Response
Reflex actions are typically very fast, protecting us from harm.

The reflex to cough instantly clears the throat.
Compare with
automatichabitualinstinctiveinvoluntarymechanisticreactancespontaneousunthinking
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