airheaded
dizzy
empty-headed
featherbrained
flighty
flippant
flyaway
giddy
head-in-the-clouds
idle
light
light-headed
light-minded
scatter-brained
silly
trivial
aimless
airy
amorphous
asinine
birdbrained
birdwitted
brainless
butterfly
buxom
capricious
casual
catchpenny
childish
contemptuous
desultory
disarticulated
discontinuous
disjunct
disordered
dispersed
disproportionate
empty
erratic
fatuous
featherheaded
fitful
flimsy
flip
fluffy
fluttery
foolish
formless
fribble
fribbling
fribblish
frippery
frivol
frothy
futile
frivolity
extravagant
irresponsible
licentious
petty
reckless
senseless
thoughtless
unjust
vain
wanton
worldly
worthless