Knee-Jerk, Involuntary Reaction
This page is the CodyCross answer for the clue below from Greece, Group 662, Puzzle 4 (Temple of Apollo).
Question is: Knee-Jerk, Involuntary Reaction
and the answer is: REFLEX
Word Meaning:
REFLEX — An automatic response to a simple stimulus which does not require mental processing.
Definitions from Wiktionary.