Not yet tested, demonstrated, or verified to be true or effective; lacking sufficient evidence or proof.
From English prefix 'un-' (not) + 'proven' (past participle of prove, from Old French 'prover'). Created in English as a straightforward negation.
In science, 'unproven' doesn't mean 'false'—it means there just isn't enough data yet—so calling something unproven is actually a specific technical statement that it hasn't been properly tested, not that it doesn't work.
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