infallible
adjective
in·fal·li·ble
(ˌ)in-ˈfa-lə-bəl
1
: incapable of error : unerring
an infallible memory
2
: not liable to mislead, deceive, or disappoint : certain
an infallible remedy
3
: incapable of error in defining doctrines touching faith or morals
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Merriam-Webster unabridged
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