acting
ephemeral
episodic
evanescent
finite
fly-by-night
fugacious
improvised
interim
jury-rigged
makeshift
passing
pro tem
pro tempore
shipboard
short-lived
temporal
terminable
transient
transitory
working
able to adapt
adaptable
adjustable
alterable
alterative
brittle
capricious
changeable
checkered
corruptible
deciduous
dying
ever-changing
fading
fickle
fleeting
flexible
flitting
fluid
flying
fragile
frail
fugitive
impetuous
impulsive
inconstant
insubstantial
kaleidoscopic
malleable
many-sided
metamorphic
mobile
modifiable
momentary
mortal
movable
mutable
nondurable
nonpermanent
nonuniform
perishable
permutable
plastic
protean
proteiform
impermanence
illusive
no-self
nonself
notself
polyhedron
susceptive