目瞪口呆 (mù dèng kǒu dāi): Stunned and speechless / Gaping in astonishment (adjective/idiom) — Meaning & Stroke Order

When you saw that spectacular scene, weren't you completely stunned and speechless?

The magician made a dove appear, and the audience was all stunned.

He was not stunned and speechless by this sudden turn of events.

Seeing their child solve the difficult problem instantly, the parents were so surprised they were stunned and speechless.