Definitions

1. adverb

in a way that is certain to be correct or successful; without error or fault.

“She solved the complex puzzle infallibly, impressing her friends with her skills.”

2. adverb

in an unwavering or unshakeable manner.

“He navigated the treacherous terrain infallibly, despite the inclement weather.”

3. adjective

not capable of being wrong or mistaken.

“The infallible system of checks and balances kept the government in check.”