Preoccupied
Preoccupied (adj) /ˌpriːˈɒk.jʊ.paɪd/ US /-ˈɑː.kjuː-/
focusing all your attention on something particular and not paying attention to other things due to being worried or nervous – anxious, thoughtful, inattentive, pensive, engrossed
She’s taken a term off at the university because she’s preoccupied with her silk young daughter these days.
Antonyms: carefree, indifferent