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baseless
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built on sand
chimerical
empty
flimsy
gratuitous
hypothetical
idle
ill-founded
illusory
imaginary
inconclusive
indecisive
not following
not proved
not well-founded
speculative
suppositional
tenuous
unascertained
unattested
unauthenticated
unbased
uncalled-for
uncertified
unconfirmed
uncorroborated
undemonstrated
undetermined
unestablished
unfixed
unfounded
ungrounded
unjustifiable
unjustified
unproved
unproven
unreasonable
unsettled
unshown
unsound
unsubstantiated
unsupportable
unsupported
unsupported by evidence
unsustainable
unsustained
untenable
untested
untried
unvalidated
unverified
unwarranted
vain
without basis
without foundation
without grounds
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