extranoematic
extrapsychic
outside world
out of the box
absence
in another world
in one's own little world
in one's own world
in a world of one's own
intrapsychological
extramental
lost in thought
allopsychic
intrapersonally
train of thought
uncollected
train of thoughts
intrapersonal
abstracted
absentminded
thoughtproof
in one's head
absent
scatty
blue-sky thinking
circuit
echo chamber
mindedness
thoughtless
intrusive thought
simplicity
musing
mind-altering
stir
intersubjective
introjection
put out of one's head
reflectiveness
notionlessness
tachyphrenia
tabula rasa
ideogenic
make a better door than a window
reflectivity
netherthought
mind
in idea
aquastor
epidemic
superconscious