noun, noun or participle which takes 'suru', intransitive verb
stupefaction; being beside oneself
Describes a state of being so shocked, upset, or overwhelmed that one loses composure or self-possession. Often used in literary or formal contexts.
突然の訃報に、彼は自失した。
He was stupefied by the sudden news of the death.
自失のあまり、しばらく言
In my stupefaction, I was at a loss for words for a while.