Hatarakanai Futari - Vol. 11 Ch. 647 - A Man's Cooking

[MangaDex]

 

[FirstDayRegister]

I don't know if the Japanese actually says retard or the usual baka, but this retard is funny. lol

 

[Glomoro]

@FirstDayRegister I'd say if they're using retard it was at least bakayaro. I think with baka, you're getting perhaps a "fool" or "idiot" level, but the added -yaro jumps it up more to the range of "dumbass."