Unproven claims are slander or quackery regardless of disprovability.

Evidence

Thus, in a discussion of a demand for shifting the burden of proof, there is no getting around the statement that a conspiracy claim without evidence is nothing but slander, a therapy without proof of efficacy is nothing but quackery – regardless of whether one can prove the opposite. — Holm Gero Hümmler, Ulrike Schiesser, Fact and Prejudice, 766

Categorization

• CANDY: A crisp, tweetable verdict on burden of proof.
• XREF: connects to: Falsifiable claims coexisted with advisers rejecting evidential standards outright — Lee McIntyre, Post-Truth, 25

Related

• Claims without evidence cannot be refuted by counter-evidence. (similarity 0.81)
• Believers routinely demand proof of nonexistence for supernatural claims (similarity 0.79)
• Knowledge’s provisionality obligates claimants to unknown truths to provide evidence. (similarity 0.78)