What is An adjective for cease?

There isn't a single perfect adjective for "cease" as it depends on the specific context and the nuance you want to convey.

Here are some options, depending on the desired meaning:

For "ending" or "stopping":

* Final

* Terminal

* Conclusive

* Definitive

* Abrupt (if the ceasing is sudden)

* Gradual (if the ceasing is slow)

For "no longer existing":

* Extinct

* Defunct

* Obsolete

For "stopped by force":

* Suppressed

* Quelled

* Stifled

For "stopped voluntarily":

* Voluntary

* Deliberate

* Intentional

For "stopped by something else":

* Interrupted

* Halted

* Suspended

The best choice will depend on the specific situation.