What is a synonym for perpetual?

Here are some synonyms for "perpetual", depending on the context:

General:

* Eternal

* Everlasting

* Endless

* Continuous

* Unending

* Permanent

* Constant

* Incessant

Formal:

* Indefinite

* Evermore

Informal:

* Forever

* All the time

* Non-stop

The best synonym will depend on the specific situation and the tone you want to convey.