What is another word for 'infallible'?

Synonyms for INFALLIBLE: essential, indispensable, inevitable, necessary, needed, needful, required, requisite, unavoidable, undeniable, unerring, not liable to err, certain, sure, unfailing, not liable to fail, foolproof, omniscient, sure-fire, faultless, bulletproof, can't-miss, fail-safe, surefire, etc.

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