abstracted

If you're abstracted, you're preoccupied with thoughts other than what's going on around you. An abstracted person on the bus might forget to get off at her stop.

When your abstracted friend doesn't answer your repeated questions, it's not just because he's not listening — his mind is absorbed by heavy thoughts or worries that make him inattentive. Being distracted is similar, but abstracted implies that it's something inside you that's pulling your attention away, rather than a TV screen, the smell of nachos, or the sound of laughter. Abstracted is from the Latin root abstractus, "drawn away."