What is an antonym for pun?

There isn't a perfect single-word antonym for "pun," as it describes a specific type of humor. However, depending on the context, you could consider these options:

For the literal meaning of "pun" (a play on words):

* Seriousness

* Literalism

* Directness

* Straightforwardness

For the humorous aspect of a pun:

* Humorlessness

* Dullness

* Seriousness

* Solemnity

Other related words:

* Fact

* Truth

* Reality

* Seriousness

Ultimately, the best antonym for "pun" will depend on the specific context and the nuance you want to convey.