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
Walburga	-	German
Annigoni	[æni'gəuni:]
Themba	-	Southern African, Zulu
German	['dʒə:mən]
Eua	-	Biblical Greek
Elham	-	Persian