Choose the word closest in meaning to ‘infallible’.

Concept

A synonym is a word whose meaning is the same as, or very close to, that of another word. ‘Infallible’ describes a person, method, or system considered incapable of error or failure.

Application

Among the choices, ‘Reliable’ is closest because it describes something dependable and consistently trustworthy. In ordinary vocabulary questions, this is the nearest available match to the idea of being unfailing or not prone to error.

Contrast

• ‘Irritable’ concerns a tendency to become annoyed.

• ‘Fashionable’ concerns current popularity or style.

• ‘Successful’ concerns achieving a desired outcome.

• ‘Clumsy’ concerns awkwardness or poor coordination.

Cross-check

In the phrase ‘an infallible method,’ replacing the tested word with ‘a reliable method’ preserves the intended idea of dependability better than any other offered choice. Therefore, the closest offered synonym is ‘Reliable’.