Finagle's Law is a term used to describe the notion that anything that can go wrong, will go wrong. Its antonyms would be words or phrases that suggest the opposite of this idea. For instance, synonyms for success, smoothness, or ease, such as serendipity, good fortune, and luck, would be antonyms. Words that imply predictability, stability, and consistency, such as order, control, and certainty, would also be antonyms. Essentially, any word or phrase that evokes the opposite of chaos, confusion, or mishap would serve as an antonym for Finagle's law.