Definition of unsubstantiated in English:

unsubstantiated

Line breaks: un|sub¦stan¦ti|ated
Pronunciation: /ʌnsəbˈstanʃɪeɪtɪd
 
/

adjective

Not supported or proven by evidence: unsubstantiated claims
More example sentences
  • Indeed, he did not himself acknowledge that he had recycled an unsubstantiated claim without any evidence that it was true.
  • Educational personnel were the single most likely group to make unsubstantiated claims of child abuse.
  • With the flamboyant, unsubstantiated claims come exaggerated insults directed at anyone who criticises or questions his work.
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

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Word of the day hubris
Pronunciation: ˈhjuːbrɪs
noun
excessive pride or self-confidence