concerned
thoughtful
absent
absentminded
absorbed
absorbed in
abstracted
assiduous
bemused
besotted
blind
buried in
buried in thought
castle-building
caught up in
constant
contemplating
contemplative
continuing
daydreaming
daydreamy
deaf
deep
devoted
devoted to
diligent
dogged
dreaming
dreamy
drowsing
ecstatic
elsewhere
enduring
engaged
engaged in thought
engrossed
engrossed in
engrossed in thought
faithful
faraway
fixated
forgetful
gripped
half-awake
held
hung-up
immersed
immersed in
immersed in thought
immutable
in a reverie
occupied
unoccupied