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。Expressions総そう領りょうの甚じん六ろくfirstborns tend to be less clever
