自由気まま
1
free;unfettered;according to one's own whims;doing as one likes
あいつって自由気ままに暮らしてるよな。ちょっとは落ち着いた方がいいんじゃないかな。
He lives a freewheeling life. I think he ought to settle down a little.
Other forms
自由気儘 【じゆうきまま】 (rarely used kanji form)