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Unsustainable
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Thesaurus
baseless
controvertible
empty
groundless
idle
ill-founded
unattestable
unbased
unconfirmable
undemonstrable
undemonstratable
unfounded
ungrounded
unprovable
unsubstantiatable
unsupportable
unsupported
unsustained
untenable
unverifiable
unwarranted
vain
without basis
without foundation
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