1. Beliefs or suppositions that lack a solid basis in fact or evidence; assumptions made without proper justification or logical foundation
The report was based on unfounded assumptions about market trends.
O relatório foi baseado em suposições infundadas sobre as tendências de mercado.
2. Conclusions drawn without adequate evidence or reasoning to support them
We should not make unfounded assumptions about people's intentions.
Não devemos fazer suposições infundadas sobre as intenções das pessoas.