sad
thoughtful
absent
absentminded
absorbed
abstracted
atrabiliar
atrabilious
bemused
blue
brooding
castle-building
cogitative
cognitive
concentrating
concentrative
conceptive
conceptual
conceptualized
contemplating
contemplative
daydreaming
daydreamy
deliberating
deliberative
dreaming
dreamy
drowsing
ecstatic
elsewhere
engrossed
excogitating
faraway
funky
grave
half-awake
ideative
in a reverie
in a trance
in the clouds
introspective
lost
lost in thought
meditating
meditative
melancholic
melancholy
mental
mooning
moonraking
museful
musing
austere
dejected
listless
moody
reflective
regretful
reverent
somber
sullen
tranquil
uneasy
wistful
apprehensive
comprehensive
counteroffensive
defensive
expensive
extensive
hypertensive
inexpensive
inoffensive
intensive
offensive