thoughtlessly
anoetic
incogitant
sloppy-mindedness
unthinking
thoughtless
make a better door than a window
unthinkingly
aphrenia
uncollected
anoia
silly
in another world
in one's own world
dereism
in one's own little world
in a world of one's own
absentminded
absent
abstracted
scatty
nonthinking
mindlessness
mindless
unreflective
simplicity
reflectiveness
notionlessness
reflectivity
childish
unreasoningly
disassociation
few sandwiches short of a picnic
thoughtproof
vacancy
étourderie
rocks in one's head
abstractedly
vacuous
unemotionalism
impulsive
madcap
tearaway
brainish
brain-dead
impetuous
hotheaded
muller
aversion
muser