What is a synonym for serene?

Here are some synonyms for serene, depending on the specific nuance you want to convey:

General synonyms:

* Calm

* Peaceful

* Tranquil

* Quiet

* Still

* Placid

* Unruffled

* Composed

* Relaxed

More poetic synonyms:

* Serene

* Tranquil

* Peaceful

* Gentle

* Soothing

* Harmonious

* Balanced

* Ethereal

* Heavenly

Synonyms emphasizing lack of disturbance:

* Untroubled

* Undisturbed

* Unworried

* Peaceful

* Relaxed

* Composed

Synonyms emphasizing beauty and tranquility:

* Picturesque

* Idyllic

* Lovely

* Beautiful

The best synonym for "serene" will depend on the context of your writing.