forbidden - definition and synonyms

 
adjective 

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/fə(r)ˈbɪd(ə)n/
  1. 1
    not allowed according to a rule, law, or custom

    Smoking is forbidden in all parts of the building.

    strictly/expressly forbidden:

    The use of mobile phones in the library is strictly forbidden.

  2. 2
    a forbidden place is one that most people are not allowed to enter

    An electrified fence marks the forbidden border zone.

  3. 3
    forbidden activities or subjects are things you should not do, talk about, or know about, for example because they are considered morally bad

    forbidden books/secrets

    a forbidden romance