Synonyms of unsubstantiated in English:


See US English definition of unsubstantiated

See UK English definition of unsubstantiated


1‘there were unsubstantiated allegations of serious misbehaviour’

unconfirmed, unsupported, uncorroborated, not backed up by evidence, unverified, unattested, unproven, not validated, untested
unfounded, ill-founded, groundless, baseless, without basis, without foundation, unjustified, unwarranted, unjustifiable, unreasonable
speculative, conjectural, assumed, presumed
questionable, open to question, disputable, debatable
unreliable, untrustworthy, dubious, doubtful, tenuous, spurious, suspect, flimsy, weak, nebulous, unsound, undependable
informal iffy
British informal dodgy
rare unestablished, suppositious, suppositive

well founded, undeniable