* Formal: The Pope, as the head of the Catholic Church, is considered to have the infallibility on matters of faith and morals.
* Informal: No one is infallible, and even the most experienced doctor can make a mistake.
* Humorous: My car's navigation system claims infallibility, but it always seems to get me lost in the most inconvenient places.
* Philosophical: The concept of human infallibility has been debated by philosophers for centuries.
Remember, "infallibility" refers to the state of being incapable of making mistakes.