occupied (adj.)

• absorbed
• abstracted
• busy
• colonized
• contemplative
• devoted
• employed
• engaged
• engrossed
• inhabited
• intent
• introspective
• involved
• meditative
• monomaniacal
• obsessed
• peopled
• populated
• populous
• preoccupied
• rapt
• settled
• single-minded
• studious
• tenanted
• working