General:
* No longer
* Not anymore
* Not any longer
* Never again
* No more
More specific:
* Currently (when used in a negative sense)
* At present (when used in a negative sense)
* Nowadays (when used in a negative sense)
Examples:
* I don't go to the movies anymore. (I no longer go to the movies.)
* She doesn't live here anymore. (She doesn't live here any longer.)
* I don't eat meat anymore. (I never eat meat again.)
* He doesn't work here anymore. (He currently doesn't work here.)
The best synonym will depend on the specific sentence and the meaning you want to convey.