Initialreaction

5 clues
Gut response
First impulse
Snap judgment
Off-the-cuff response
Knee-jerk response, perhaps
Similar answers:
Badreaction
Chainreaction
Chainreactions
Chanreaction
Delayedreaction
Fusionreaction
Geniejerkreaction
Goatreaction
Gotnoreaction
Gutreaction
Gutreactions
Hostilereaction
Initial
Initialascent
Initialed
Initialers
Initialinvestment
Initializations
Initialize
Initializing