godan verb (-ru), intransitive verb
be completely at a loss; be greatly perplexed; be sorely troubled
Expresses a state of being utterly bewildered or having no idea what to do. Often used when facing a difficult problem or an embarrassing situation.
彼は突然の質問に困り切っていた。
He was completely at a loss at the sudden question.
どう答え
Not knowing how to answer, I was utterly perplexed.