From The Collaborative International Dictionary of English v.0.44 [gcide]:
Unfounded \Un*found"ed\, adjective
1. Not founded; not built or established. --Milton.
2. Having no foundation; baseless; vain; idle; as, unfounded expectations. --Paley.
From WordNet (r) 2.0 [wn]:
adjective
1: without a basis in reason or fact; "baseless gossip"; "the allegations proved groundless"; "idle fears"; "unfounded suspicions"; "unwarranted jealousy" [syn: {baseless}, {groundless}, {idle}, {unwarranted}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
104 Moby Thesaurus words for "unfounded": 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
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