Definition of Unsubstantiated

not supported by evidence or proof

Examples of Unsubstantiated in a sentence

His unsubstantiated claim of being related to royalty could not be taken seriously, as he had no proof to support it. 🔊

While some people believe that there is an alternate reality for every possible outcome, this belief cannot be proven and is therefore unsubstantiated. 🔊

Many TV fans put forth unsubstantiated theories of what they think will happen in their favorite shows, but they are usually disappointed by reality. 🔊

While it is entirely possible that sentient aliens exist elsewhere in the galaxy, that belief is currently unsubstantiated, with no evidence to back it up. 🔊

I believe that my phone was stolen by the kid that sits behind me in class, but unfortunately my claim is unsubstantiated, since no one witnessed the crime. 🔊

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