Synonyms of unfounded in English:

unfounded


See definition of unfounded

adjective

1‘the article was a piece of unfounded speculation’

SYNONYMS
groundless, baseless, 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, substantiated