Definition

In a way that is incapable of making mistakes or being wrong; always correct or reliable.

Example

The scientist infallibly predicted the outcome of the experiment.

Conversation

Do you think he can answer all our questions infallibly?

Well, he's pretty knowledgeable, so I wouldn't be surprised.

Yeah, but sometimes it's hard to trust someone to be infallibly right all the time.

True, we just have to take their advice with a grain of salt.

Synonyms & Antonyms

Root Explanation

Infallibly → It is formed from "in-" (meaning not) and "fallere" (meaning to deceive or to fail) combined with the suffix "-ly" (meaning in a manner). The word "infallibly" means in a manner that does not fail or cannot be deceived.

Memory Tip

Think of 'not failing' ('in-' means not and 'fallere' means to fail) to remember that 'infallibly' describes something that is certain or cannot go wrong.

Visually Confused Words