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Abjure
Strong Rejection
Using 'abjure' conveys a powerful distancing from a belief or principle, often implying regret or error in the past. 
Public Statement
'Abjure' usually involves a public or formal announcement, suggesting a serious and deliberate action. 
Irreversible Decision
The action of abjuring is often final, indicating a definitive turning away from something with no intention to return. 