甚じん六ろくじんろくMeanings1noundunce; blockhead; foolA somewhat old-fashioned or literary insult for a slow-witted or foolish person. Not commonly used in modern casual speech.彼かれは甚じん六ろくだから、何なにを言いっても無む駄だだ。He's a blockhead, so it's no use telling him anything.
