Here's what rhymes with uncorroborated.

Consider these alternatives

unsubstantiated / dated unverified / side corroborated / dated unverifiable / viable corroboration / operation imprecise / price gleaned / seemed intimation / information runaround / found anecdotal / total forewarning / morning unattributed / distributed sketchy / already unproved / used supposition / position untruthful / useful circumstantial / sample unsupported / imported untrue / you substantiated / dated corroborates / states specious / pieces salacious / basis corroborate / late unreliable / liable