reflex

Being an involuntary action or response, such as a sneeze, blink, or hiccup.

Produced as an automatic response or reaction.

Bent, turned, or thrown back; reflected.

Reflexed.

An involuntary response to a stimulus.

A person’s ability to respond to new or changing stimuli.

An unlearned or instinctive response to a stimulus.

A form or feature that reflects or represents an earlier, often reconstructed, form or feature having undergone phonetic or other change.