flinch

This term captures a sudden, involuntary physical recoil. It is often used to describe the micro-expressions of the face or small jerks of the body that occur before the mind has fully processed a threat. In a physical sense, it conveys a lack of control over one's reflexes, often signaling vulnerability or shock.

When used figuratively, the word describes a psychological steadfastness. To not flinch in the face of adversity suggests a stoic or courageous disposition, where the individual refuses to be intimidated or deterred by a daunting prospect. This creates a sharp contrast between the physical weakness of a reflex and the mental strength of resolve.