Meaning of “preoccupied” - Learner’s Dictionary

preoccupied

adjective us uk /ˌpriːˈɒkjəpaɪd/

thinking or worrying about something a lot:

She's been very preoccupied recently.
He's far too preoccupied with his own problems to notice mine.
preoccupy verb [ T ] us uk /ˌpriːˈɒkjəpaɪ/

If something preoccupies you, you think or worry about it a lot.

(Definition of “preoccupied” from the Cambridge Learner’s Dictionary © Cambridge University Press)