RichThesaurus
unsustainable
unsustainable
synonyms
untenable
unwarranted
weak
shaky
indefensible
unsound
groundless
irrational
implausible
insupportable
senseless
ill-founded
illogical
flawed
unjustified
unfounded
specious
defective
invalid
unjustifiable
absurd
faulty
flimsy
preposterous
baseless
unacceptable
unwarrantable
impossible
unendurable
no-win
refutable
undefendable
intolerable
unarguable
inadmissible
unbearable
arbitrary
desolate
untenable
unsound
weak
uninhabitable
flimsy
intolerable
wrong
helpless
flawed
unsupportable
impossible
unfounded
unsustainable
definitions
adj
Not sustainable.