destructive
extravagant
inefficient
pound-foolish
prodigal
profligate
spendthrift
uneconomic
uneconomical
baneful
calamitous
cataclysmal
cataclysmic
catastrophic
consuming
consumptive
deadly
demolishing
demolitionary
depredatory
desolate
desolating
destroying
devastating
disastrous
dissipative
doomful
easy come
easy go
fatal
fateful
fratricidal
incontinent
intemperate
internecine
lavish
nihilist
nihilistic
overgenerous
overlavish
overliberal
penny-wise and pound-foolish
profuse
ravaging
ruining
ruinous
self-destructive
subversionary
corrupt
costly
frivolous
frustrate
improvident
irrational
negligent
selfish
senseless
unnecessary
unprofitable
unreliable
unwise
wanton
distasteful
tasteful
stingy
œconomical