thoughtful
absent
absentminded
absorbed
absorbed in
abstracted
bemused
brooding
buried in
castle-building
caught up in
cogitative
cognitive
concentrating
concentrative
conceptive
conceptual
conceptualized
considerative
contemplating
contemplative
daydreaming
daydreamy
deliberating
deliberative
devoted
devoted to
do-nothing
dormant
dreaming
dreamy
drowsing
ecstatic
elsewhere
engaged
engrossed
engrossed in
excogitating
excogitative
faraway
half-awake
ideative
idle
immersed in
immobile
in a reverie
in the clouds
inactive
inert
intent
meditate
meditation
meditator
dejected
devotional
devout
introspective
mournful
mystical
pensive
philosophic
rapt
reflective
reverent
studious
tranquil