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
Kaiser	-	Various
Omer	‘om-ER	Hebrew
Kambujiya	-	Ancient Persian
White	[wait]
VoldemĀRs	-	Latvian
Colin (1)	KAHL-in (Scottish, Irish, English), KOL-in (English)	Scottish, Irish, English