ignorant - definition and synonyms

adjective 

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/ˈɪɡnərənt/
  1. 1
    not knowing something that you should know or need to know
    ignorant of:

    I was ignorant of the terms used in business.

  2. 2
    British spoken not knowing the right way to behave or to treat people

    He’s so ignorant!

derived word

ignorantly

adverb