* Permanent: This is the most common antonym, meaning lasting forever or for a very long time.
* Enduring: Similar to permanent, this suggests something that lasts through time and challenges.
* Eternal: This implies something that has no beginning or end, existing forever.
* Stable: This focuses on something that is not easily changed or moved.
* Lasting: This emphasizes the duration of something.
* Fixed: This emphasizes the unchanging nature of something.
The best antonym will depend on the specific meaning of "transitory" in your sentence.