Unfounded1. (a.) Not founded; not built or established.
2. (a.) Having no foundation; baseless; vain; idle; as, unfounded expectations.
Thesaurus Entries
Barmecidal, Barmecide, airy, apparent, apparitional, autistic, baseless, bottomless, chimeric, contrary to fact, deceptive, delusional, delusionary, delusive, delusory, dereistic, dishonest, dreamlike, dreamy, empty, erroneous, fallacious, FALSE, fantastic, garbled, gratuitous, groundless, idle, ill-founded, illusional, illusionary, illusive, illusory, imaginary, in error, inauthentic, inconclusive, indecisive, mendacious, miscited, misleading, misquoted, misreported, misstated, not following, not proved, not true, ostensible, phantasmagoric, phantasmal, phantom, seeming, self-deceptive, self-deluding, specious, spectral, spurious, supposititious, truthless, unactual, unascertained, unattested, unauthentic, unauthenticated, unauthoritative, unbased, uncalled-for, uncertified, unconfirmed, uncorroborated, undemonstrated, undetermined, unestablished, unfixed, ungrounded, unjustifiable, unjustified, unproved, unproven, unreal, unreliable, unsettled, unshown, unsound, unsubstantial, unsubstantiated, unsupportable, unsupported, unsupported by evidence, unsustainable, unsustained, untenable, untested, untried, untrue, untruthful, unvalidated, unverified, unwarranted, vain, visionary, without basis, without foundation, without grounds