unfounded
adj. C1 Advanced US //ənˈfaʊndɪd// UK //ʌnfˈaʊndɪd// un·found·ed
adj. not based on facts or evidence. You use this to describe a worry, a rumor, or an idea that is not true.
adj. lacking a sound basis in fact or evidence. Often describes claims, fears, or allegations that have no empirical support.
The rumors about the company closing were completely unfounded.
The investigation concluded that the allegations of corruption were unfounded and based on hearsay.
Despite the widespread panic, scientific data proved that the public's fears regarding the environmental impact were largely unfounded and based on a misunderstanding of the report.
From un- + founded.
Usage
Typically used to modify nouns like 'rumors', 'fears', 'claims', or 'allegations'.