What is the synonym for astonished?

There are many synonyms for "astonished," depending on the specific nuance you want to convey. Here are some options:

Stronger/More intense:

* Amazed

* Bewildered

* Dumbfounded

* Stunned

* Overwhelmed

* Speechless

* Disbelief

* Incredulous

More neutral:

* Surprised

* Startled

* Taken aback

* Nonplussed

* Shocked

More specific:

* Awestruck: Impressed with wonder or admiration

* Enthralled: Captivated and fascinated

* Rapt: Completely absorbed in something

* Spellbound: Held under a magic spell; captivated

The best synonym will depend on the context of your sentence.