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infallible

adjective
     
in‧fal‧li‧ble
1 always right and never making mistakes [≠ fallible]:
No expert is infallible.
an infallible memory
2 something that is infallible always works or has the intended effect:
He had an infallible cure for a hangover.
infallibly adverb
infallibility noun [uncountable]

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