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The rumors are completely unsubstantiated and they should not be reported as factual by the newspaper.
Unsubstantiated means not proven, or not supported by facts. "That is an unsubstantiated rumor," is an example of the word in context.
unsubstantiated
Even though her boss had no concrete information, she was fired due to unsubstantiated rumors floating around about her.
UNSUBTANTIADED