Select the word that has the opposite meaning as the given word: Infallible

The chosen word, "faulty," is the correct antonym for "infallible." The term "infallible" refers to something that is incapable of making mistakes or being wrong, implying complete reliability and perfection in its functionality or accuracy. In contrast, "faulty" suggests the presence of flaws, errors, or defects, which directly opposes the notion of being infallible.

The other choices do not provide suitable opposites. "Acceptable" refers to something that meets a standard, but it does not imply the absence of mistakes or errors. "Flawless" suggests perfection, similar to "infallible." "Difficult" pertains to the level of challenge or ease but does not relate to the accuracy or reliability implied by "infallible." Therefore, "faulty" stands out as the most appropriate antonym in this context.