unsubstantiated
definition
not supported by evidence or proof
example
The journalist faced criticism for publishing unsubstantiated claims about the politician.
synonyms
unverifiedunsupportedbaseless
word origin — The word 'unsubstantiated' comes from the prefix 'un-' meaning 'not,' combined with 'substantiated,' which is derived from the Latin 'substantiatus,' the past participle of 'substantiare,' meaning 'to establish or give substance to.'