noun, noun which may take the genitive case particle 'no'
extremely troubled; very puzzled; at a complete loss
Describes a state of being deeply perplexed or greatly distressed, often due to an unexpected problem. Used as a noun or with の to modify another noun.
突然の停電で大弱りだ。
I'm at a complete loss because of the sudden power outage.
彼は大弱りの顔で助けを求めた。
He asked for help with a very troubled look on his face.