thoughtful, pensive
Él es una persona muy pensativa.
He is a very thoughtful person.
Ella tenía una cara pensativa.
She had a thoughtful look on her face.
Perdóname, querido, estaba algo pensativa.
Forgive me, dear, I was a little pensive.
— Solaris (1972)
En la ventana había sentada una niña con cara pensativa.
A little girl with a thoughtful expression sat by the window.