The word for today is…
infallible (adjective):
1: incapable of error : unerring
2: not liable to mislead, deceive, or disappoint : certain
3: incapable of error in defining doctrines touching faith or morals
Source : Merriam -Webster
Etymology : Watch out when you hear about infallible predictions, an infallible plan, an infallible cure, or even infallible lip gloss. Infallible isn't a claim that scientists, engineers, and doctors like to make, so you're probably getting better information when the word not comes first. You may have heard the phrase "papal infallibility", which refers to the official position of the Roman Catholic church, adopted in the 19th century, that certain solemn statements made by a Pope about faith or morals were not to be questioned. Popes since then have been careful not to make many of these statements. The word is Middle English, from Medieval Latin infallibilis, from Latin in- + Late Latin fallibilis fallible and was first used in the 15th century.
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