"reflex" in the noun sense
1. reflex, reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction
an automatic instinctive unlearned reaction to a stimulus
"reflex" in the adjective sense
1. automatic, reflex, reflexive
without volition or conscious control
"the automatic shrinking of the pupils of the eye in strong light"
"a reflex knee jerk"
"sneezing is reflexive"
Source: WordNet® (An amazing lexical database of English)
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