lost
preoccupied
bemused
musing
contemplation
thoughtless
mind
lost in thought
well thought out
absentminded
scatty
run
abstracted
absent
submind
think
cognitively
ponderable
cogitable
ponderingly
stir
misreflect
hypermentalizing
roof-brain chatter
aphrenia
train of thoughts
considerate
metacogitate
intellection
contemplate
ponderosity
thinking
challenging
intermental
cerebration
in agreement
mentation
thought process
thought
thought-provoking
higher-order
wheels are turning
expressive
ponderability
in one's own little world
cerebation
think about
in one's own world
thoughtful
landscape