Neverfailing is defined as something that is constantly reliable or infallible. Antonyms, on the other hand, are words with opposite meanings. Some possible antonyms for neverfailing could be inconsistent, erratic, unreliable, fallible, uncertain, or untrustworthy. These words describe things that cannot be depended upon to maintain a consistent level of reliability or excellence. They may be prone to failure, mistakes, or unreliability. While neverfailing implies an unwavering reliability, its antonyms suggest a degree of uncertainty or risk associated with the object or action being described. It is important to choose the appropriate antonym based on the context in which it is being used.