General antonyms:
* Irrelevant: This is the most straightforward and common antonym.
* Unrelated: This implies a complete lack of connection.
* Insignificant: This suggests that something is unimportant or trivial.
* Extraneous: This means something that is not essential or necessary.
Specific antonyms:
* Unimportant: This is a strong antonym, suggesting that something is completely lacking in value.
* Unconnected: This emphasizes the lack of any link or relationship.
* Superficial: This implies that something is not deep or meaningful.
* Frivolous: This suggests that something is lighthearted and unimportant.
The best antonym for "relevant" will depend on the specific situation and what you want to emphasize.