Crossword Genius

Unthinking, of a reaction (4,4)

Ross

I believe the answer is:

knee jerk

(Other definitions for knee jerk that I've seen before include "Spontaneous" , "Sudden and ill-considered" , "(Of a response) automatic and unthinking" , "Type of automatic reaction" , "(Of a reaction) automatic and unthinking" .)

I've seen this clue in The Guardian.
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