Loose; not tight (e.g., clothes or a belt).
このスカートはウエストがルーズでずり落ちそうだ。
This skirt's waist is loose and looks like it might slip down.
彼のネクタイはルーズに結ばれていた。
His tie was tied loosely.
サイズがルーズなジーンズが今の流行だ。
Loose-sized jeans are in fashion now.
Careless; slovenly; not diligent — describing an attitude or way of working that is sloppy or negligent.
仕事がルーズだと信用を失うよ。
If you're careless with your work you'll lose people's trust.
彼は時間にルーズで約束を守らないことが多い。
He's lax about time and often doesn't keep appointments.
ルーズな整理整頓は事故のもとになる。
Sloppy tidying can lead to accidents.