na-adjective, noun
Used for plans, systems, attitudes, and physical objects that can bend or adjust. Often interchangeable with 柔軟 (じゅうなん), but フレキシブル sounds more modern and casual.
この契約はフレキシブルに変更できます。
This contract can be changed flexibly.
彼はフレキシブルな考え方を
He has a flexible way of thinking.