Question

infallible Two college friends of mine claimed to have an infallible system for beating the odds at roulette in Las Vegas. ˌɪnˈfæləbəl

Accepted Answer

(1) Not capable of being wrong or making mistakes. (2) Certain to work properly or succeed. 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.

word	infallible
definition	(1) Not capable of being wrong or making mistakes. (2) Certain to work properly or succeed.
eg_sentence	Two college friends of mine claimed to have an infallible system for beating the odds at roulette in Las Vegas.
explanation	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.
IPA	ˌɪnˈfæləbəl

Infallible Capable Wrong Making Mistakes Work Properly Succeed