Careless; instinctive (10)

I believe the answer is:

unthinking

This clue is a double definition.

'careless' is the first definition.
(thesaurus)

'instinctive' is the second definition.
(thesaurus)

(Other definitions for unthinking that I've seen before include "inconsiderate" , "Knee-jerk" .)

I've seen this clue in the Sydney Morning Herald.

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.