What is the Antonym of forgettable?

The antonym of forgettable depends on the context, but here are some possibilities:

General antonyms:

* Memorable

* Unforgettable

* Remarkable

* Noteworthy

* Significant

* Impressive

More specific antonyms:

* Engaging (if talking about something entertaining)

* Moving (if talking about something emotionally impactful)

* Intriguing (if talking about something thought-provoking)

* Iconic (if talking about something widely recognized)

The best antonym will depend on the specific meaning you want to convey.