pre ‧ oc ‧ cu ‧ pied /priːˈɒkjəpaɪd, priːˈɒkjʊpaɪd $ -ˈɑːk-/ BrE AmE adjective
thinking about something a lot, with the result that you do not pay attention to other things:
What’s wrong with Cindy? She seems a little preoccupied.
preoccupied with
He’s completely preoccupied with all the wedding preparations at the moment.