ungenius

plural ungeniuses

1. countableA person who is not a genius.

   Serenus Zeitblom, serene flower of the age, good-hearted, long-winded, the ungenius par excellence whose ungenius is his license to speak.

   1995, Benjamin Taylor, Into the Open: Reflections on Genius and Modernity, page 90

   1 more example

   For a heady moment I wanted to fling the notebook down and say to them: you write about geniuses and ungeniuses if you like, but don't teach me how to do it, I won't be able to do it anyway. I'd be better acting instead of you.

   1987, Stefano Micossi, Julie A. E. Curtis, Bulgakov's Last Decade: The Writer as Hero, page 34

2. uncountableLack of genius.

   Serenus Zeitblom, serene flower of the age, good-hearted, long-winded, the ungenius par excellence whose ungenius is his license to speak.

   1995, Benjamin Taylor, Into the Open: Reflections on Genius and Modernity, page 90