Englishbaseless
adjective
the accusations were found to be baseless:
groundless, unfounded, unsubstantiated, unproven, unsupported, uncorroborated, untested, unconfirmed, unverified, unattested, unjustified, unwarranted, foundationless, ill-founded, without basis, without foundation, not backed up by evidence;
speculative, conjectural, idle, vain, unsound, unreliable, questionable, misinformed, misguided, spurious, specious, fallacious, erroneous, fabricated, untrue, trumped-up.
▷antonyms well founded, proven.