What is a antonym for proverb?

There isn't a perfect one-word antonym for "proverb." However, here are some words that convey the opposite meaning in different ways:

* Original saying: This emphasizes the lack of age and established use that characterizes a proverb.

* Novelty: This highlights the newness and lack of tradition associated with the opposite of a proverb.

* Idiom: While an idiom is similar to a proverb, it often focuses on specific phrases or expressions rather than wisdom or advice.

* Unsaid: This emphasizes the absence of a specific, widely known saying.

The best antonym will depend on the specific context in which you are using it.