Synonyms of unfounded

1 Syllable
vain
2 Syllables
falser, falsest, off-base, groundless, untrue, idle, unreal, spurious, false
3 Syllables
erroneous, mistaken, sophistic, fallacious, misleading, untruthful, baseless, bottomless, unproven, cooked-up, gratuitous, mendacious
4 Syllables
unjustified, illogical, chimerical, unwarranted, unprovoked, uncalled-for, deceptive, fabricated, foundationless
5 Syllables
unjustifiable, unsubstantiated
6 Syllables
uncorroborated
7 Syllables
misrepresentative