infaillible
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Meanings
Adjective
1. infallible (without fault or weakness; incapable of error or fallacy)
2. inevitable
Examples7
I'm not infallible.
Is Murphy's Law infallible?
This plan has no flaws.
No security system is foolproof.
No one is infallible, except Marina.
But for your steady support, my mission would have resulted in failure.