2 —used derisively to indicate that something just stated is all too obvious or self-evident Well, duh!

Is Duh a bad word?

In general, saying “duh” is fine informally but is not only rude but unprofessional with formal authorities at school or in the workplace.

What is another word for Duh?

doyno duhno kiddingreallyoh reallyno kidding, Sherlockyou don’t sayno reallythank you, Captain Obvious