The first hint to crack the puzzle "Automatic, unthinking, e.g. a __ reaction" is:

It is a word which contains 8 letters

The second hint to crack the puzzle "Automatic, unthinking, e.g. a __ reaction" is:

It starts with letter k

The third hint to crack the puzzle "Automatic, unthinking, e.g. a __ reaction" is:

It ends with letter k

Looking for extra hints for the puzzle "Automatic, unthinking, e.g. a __ reaction"

Click on any empty tile to reveal a letter

The answer for the puzzle "Automatic, unthinking, e.g. a __ reaction" is: