muggle

 
Pronunciation: /ˈmʌg(ə)l/

noun

informal
  • a person who is not conversant with a particular activity or skill: she’s a muggle: no IT background, understanding, or aptitude at all

Origin:

1990s: from mug1 + -le2; used in the Harry Potter books by J. K. Rowling to mean 'a person without magical powers'