1. Wince, recoil, shrink, quail all mean to draw back from what is dangerous, fearsome, difficult, threatening, or unpleasant. Wince suggests an involuntary contraction of the facial features triggered by pain, embarrassment, or a sense of revulsion: to wince as a needle pierces the skin; to wince at coarse language. Recoil denotes a physical movement away from something disgusting or shocking or a similar psychological shutting out or avoidance: to recoil from contact with a slimy surface; to recoil at the squalor and misery of the slum. Shrink may imply a fastidious or scrupulous avoidance of the distasteful or it may suggest cowardly withdrawal from what is feared: to shrink from confessing a crime; to shrink from going into battle. Quail suggests a loss of heart or courage in the face of danger or difficulty; it sometimes suggests trembling or other manifestations of physical disturbance: to quail before an angry mob.

Did you mean vincible?