Not based on solid evidence or facts; having no good reason or proof to support it.
From prefix 'un-' (not) plus 'founded' (from Latin 'fundus' meaning base or foundation). The compound literally means 'not having a foundation,' used since the 1600s.
Your brain loves unfounded rumors more than true facts—scientists found that false information spreads 40% faster on social media than truth because emotional 'unfounded' claims grab attention better.
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