무지성 /mu-ji-seong/
Mindless / Without thinking
Doing something completely on autopilot or impulse, without any conscious thought. Often used humorously when describing a reckless or impulsive action.
Examples
무지성으로 클릭했다가 결제됐어
I mindlessly clicked and accidentally paid
무지성으로 좋아요 눌렀어
I liked it without even thinking