preoccupied
adj.adj. thinking or worrying about something so much that you do not pay attention to other things. You might look distracted or busy because your mind is elsewhere.
adj. engrossed in thought or distracted by a particular concern to the exclusion of other matters. Often used predicatively after linking verbs such as 'seem', 'look', or 'appear'.
She seemed preoccupied and didn't hear my question.
The manager was too preoccupied with the upcoming audit to notice the morale issues within the team.
While he tried to focus on the lecture, he remained visibly preoccupied by the news he had received earlier that morning, frequently checking his phone for updates.
Typically takes the preposition 'with' or 'by' to indicate the cause of distraction.
He was preoccupied in his work.He was preoccupied with his work.Preoccupied is followed by 'with' or 'by' rather than 'in' when describing the object of focus.