Here are some ways to understand "infallible":
* Unerring: Always accurate and never mistaken.
* Immutable: Unchanging and steadfast, never wavering.
* Perfect: Without any flaws or imperfections.
* Absolute: Complete and total, leaving no room for doubt.
Examples:
* "The Pope is considered infallible in matters of faith and morals."
* "The machine's accuracy is infallible, never producing a single error."
* "She has an infallible sense of style, always choosing the perfect outfit."
It's important to note that the concept of infallibility is often used in religious and philosophical contexts, but it can also be applied in a more general sense to describe anything that is exceptionally reliable and accurate.