What is the antonym of perturbed?

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

General antonyms:

* Calm

* Peaceful

* Tranquil

* Serene

* Composed

* Unruffled

* At ease

* Relaxed

More specific antonyms:

* Unbothered (if perturbed means "worried")

* Content (if perturbed means "unhappy")

* Satisfied (if perturbed means "dissatisfied")

* Unconcerned (if perturbed means "anxious")

The best antonym will depend on the specific meaning of "perturbed" in the sentence.