apodeictic
/ˌapəˈdaɪk.tɪk/adjective
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Affording proof; demonstrative.
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Incontrovertible; demonstrably true or certain.
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Of the characteristic feature of a proposition that is necessary (or impossible): perfectly certain (or inconceivable) or incontrovertibly true (or false); self-evident.
Antonyms:
anapodeictic