Not proven or supported by evidence; lacking factual basis or solid support.
From 'un-' (not) + 'substantiated,' which comes from Latin 'substantia' (substance or essence). Added together, it means lacking the substance needed to support a claim.
The word combines 'un-' with 'substance'—so unsubstantiated claims literally have no substance or weight to them, which is why they're dismissed in science and law!
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