adj.毫无根据的，莫须有的，无端的，没理由的，不依据事实的

The rumors about his involvement in the scandal were entirely unfounded.
关于他卷入丑闻的谣言完全是无稽之谈。
Her accusations against him were shown to be unfounded.
她对他的指控被证明是毫无根据的。
Despite the widespread belief, the health risks of moderate coffee consumption are largely unfounded.
尽管普遍认为，适量饮用咖啡有健康风险，但这一观点大多是没有根据的。
The fear that artificial intelligence will take over all jobs is unfounded.
担心人工智能会取代所有工作的恐惧是没有根据的。
The allegations of corruption within the organization have been proven unfounded.
对该组织内部腐败的指控已被证实是不成立的。
The claim that vaccines cause autism has been thoroughly debunked and is unfounded.
疫苗导致自闭症的说法已被彻底揭穿，是没有科学依据的。
The belief that the earth is flat is an unfounded notion.
认为地球是平的观念是错误和没有根据的。
The notion that all teenagers are rebellious is largely unfounded.
认为所有青少年都叛逆的观点大多是无根据的。
The suspicion that aliens built the ancient Egyptian pyramids is completely unfounded.
怀疑外星人建造了古埃及金字塔的猜测完全没有根据。
The assumption that money brings happiness is often unfounded, as many wealthy individuals still struggle with emotional fulfillment.
认为金钱带来幸福的假设往往是站不住脚的，因为许多富人仍然在情感满足上挣扎。