muggle - definition and synonyms

noun [countable] informal 

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/ˈmʌɡ(ə)l/
singularmuggle
pluralmuggles
  1. an insulting word for someone who does not know about something or how to do something

    He was a complete muggle who thought he was very clever.

Word story
In the Harry Potter books by J K Rowling a Muggle is someone who is not involved in the world of magic.