noun, noun or participle which takes 'suru'
momentarily speechless; breaking off short
Describes a sudden, brief loss for words due to surprise, shock, or embarrassment. Often used with する to mean 'to be rendered speechless for a moment'.
彼の突然の告白に、彼女は一瞬絶句した。
She was momentarily speechless at his sudden confession.
あまりの無
I was so taken aback by the rude remark that I broke off short and couldn't say anything for a moment.