lost for words

unable to think of something to say at a loss for words Chris was lost for words at Kathy's incredible rudeness.

Usage notes: usually said because something has surprised you

Name	Pronounced	Usage
Vincenzo	veen-CHEN-tso	Italian
Jeffry	['dʒefri]
Michael	MIE-kəl (English), MI-khah-el (German), MEE-kah-el (Swedish, Norwegian, Danish)	English, German, Swedish, Norwegian, Danish, Dutch, Czech, Biblical, Biblical Latin, Biblical Greek
Trinity	TRIN-i-tee	English
Forrest	['fɔ:rist]
Gargi	-	Hinduism, Indian, Hindi, Bengali