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
Newt	NOOT	English
Chinweike	-	Western African, Igbo
Chihiro	chee-hee-ṙo	Japanese
Madoc	-	Welsh
Brigham	BRIG-əm	English (Rare)
Ji-Hoon	jee-hoon	Korean