impermanent
temporary
able to adapt
adaptable
adjustable
alterable
alterative
brief
brittle
capricious
changeable
checkered
circumforaneous
corruptible
deciduous
discursive
divagatory
drifting
dying
ephemeral
errant
evanescent
ever-changing
fading
fickle
fleeting
flexible
flitting
floating
fluid
fly-by-night
flying
footloose
footloose and fancy-free
fragile
frail
fugacious
fugitive
gadding
gypsy-like
gypsyish
impetuous
impulsive
inconstant
insubstantial
kaleidoscopic
landloping
transient
accidental
arbitrary
earthly
finite
fitful
illusory
incidental
momentary
outward
perishable
short-lived
superficial
temporal
trivial
unreal
unsatisfactory
unstable