座ったまま

remaining seated

→ 座る
phrase Rare #42,189
remaining seated Describes staying in a seated position without getting up. まま indicates that a state remains unchanged.
JA: 座ったまま、少し待ってください。
EN: Please wait while remaining seated.

どうか座ったまま

Please remain seated.

— 最強のふたり (2011)

何時間も座ったままつらい

Sitting for hours on end is tough.

彼はテレビのスイッチを入れてテレビの前に座ったまますぐに眠り込んでしまった

He turned on the TV and immediately fell asleep sitting in front of it.