absorbed, engrossed
Está absorto en la lectura de novelas de detectives.
He is engrossed in reading detective novels.
Él estaba absorto escuchando música.
He was engrossed in listening to music.
Se puede quedar absorto viendo la tele durante horas.
He can get absorbed watching TV for hours.
He is absorbed in his study.
Él está absorto en su investigación.
He is engrossed in his research.