英語候補to be unable to distinguish one thing from anotherto come out from the darkness with a cowto drive black hogs in the dark
頭の上の蠅も追えないあたまのうえのはえもおえない慣用句未分類completely helplessunable even to drive away the flies on one's own head
頭が上がらないあたまがあがらない慣用句ことわざ未分類to be unable to act on an equal basis withto be no match for (e.g. outclassed in authority, strength or in debt to)