duh

/dʌ/
interjection
  1. Used to express that something is obvious or that the speaker thinks someone else should have known it.
    • "The sky is blue." "Duh, everyone knows that."
    • He asked if water was wet. I just said, "Duh."
    • She rolled her eyes and said, "Duh, I already finished my homework."
  2. Used to show that you are slow to understand or are thinking.
    • He stared at the question and said, "Duh... I don't know."
    • Duh, I guess I should have read the instructions first.
    • Duh, I forgot my keys again.
Synonyms
What does "duh" mean? | whatsthatwordmean | whatsthatwordmean