* Serious: This is the most common antonym, often used when referring to humor.
* Boring: This antonym suggests a lack of entertainment or amusement.
* Dull: Similar to boring, this antonym describes something that is not interesting or engaging.
* Sad: This antonym implies a negative emotion, contrasting with the positive feeling of humor.
* Tragic: This antonym refers to something that is deeply sorrowful or serious.
* Unfunny: This is a direct opposite of "funny," simply meaning not humorous.
The best antonym will depend on the specific situation and what you want to convey.