Synonyms of unsubstantiated in English:

unsubstantiated


See definition of unsubstantiated

adjective

1‘there were unsubstantiated allegations of serious misbehaviour’

SYNONYMS

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

ANTONYMS

well founded, undeniable