Abstracted (adjective)

1. Lost in thought; preoccupied.
2. Not paying attention to one's surroundings or the people around them.
3. Not relating to or dealing with specific or practical matters; theoretical.

Origin:

From latin abstractus, from abstrahere "to draw away".

Examples:

1. He was so abstracted that he didn't even hear me enter the room.
2. She was abstracted, her mind far away from the present conversation.
3. He was so abstracted that he didn't even notice the change in the weather.
4. The artist was so abstracted that he could not finish the painting.
5. The scientist was so abstracted that he didn't even hear the phone ringing.