Crossword Genius

Without thinking (13)

Ross

I think it could be either:

automatically

spontaneously

(Another definition for spontaneously that I've seen is " Unpremeditatedly".)

I've seen this clue in The Guardian and The Telegraph.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.