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