no duh
Interjection
Meaning
no duh
(chiefly US, colloquial, sarcastic) An expression or exclamation that something is exceedingly obvious or apparent, or that one would have to be extremely foolish not to realize something immediately. [From 1962.]
It says here not to drive with the sun shade covering the windshield of your car. No duh!
Synonyms
really
thank you
Captain Obvious
duh
oh really
You're welcome
no kidding
no shit
no shit, Sherlock
no really
you don't say
lieutenant sarcasm