Antonyms:
* Unimpressed: Lacking awe or admiration.
* Indifferent: Not caring or interested.
* Bored: Feeling tired and uninterested.
* Disdainful: Showing a lack of respect or approval.
* Contemptuous: Showing or expressing contempt or disdain.
Synonyms:
* Amazed: Filled with wonder and surprise.
* Astonished: Suddenly filled with great surprise or wonder.
* Overwhelmed: Having strong emotions that make it difficult to think clearly.
* Spellbound: Held completely captivated by something.
* Mesmerized: Completely fascinated by something.
The best choice for an antonym or synonym will depend on the specific context in which you are using the word "awestruck."