What is the antonym of pun?

There isn't a single perfect antonym for "pun" because it depends on what aspect of the word you want to negate.

Here are some options, depending on the context:

* Seriousness: If you're looking for the opposite of the humor in a pun, you could use words like seriousness, sobriety, earnestness, or gravity.

* Literalness: If you want to emphasize the opposite of wordplay, you could use literal, straightforward, or direct.

* Clarity: Puns often play on ambiguity, so the opposite might be clarity, explicitness, or transparency.

* Intention: If the pun is unintentional, the opposite might be intentional, deliberate, or planned.

Ultimately, the best antonym depends on the specific context in which you're using the word "pun."