baseless
I
adjective
bottomless, empty, erroneous, false, foundationless, gratuitous, groundless, having no foundation, idle, ill-founded, illogical, nonactual, not well-founded, rootless, unbased, uncaused, uncorroborated, unfounded, ungrounded, unjustifiable, unprincipled, unreasonable, unsound, unsubstantial, unsubstantiated, unsupportable, unsupported, unsustainable, unsustained, untenable, unwarranted, vain, without base, without basis, without cause, without reality, without reason
II
index
arbitrary and capricious, gratuitous (unwarranted), ill-founded, immaterial, insubstantial, invalid, unfounded, unsupported, unsustainable, untenable, unwarranted
Burton's Legal Thesaurus.
William C. Burton.
2006