hemmelighed

noun
  1. A piece of information that is kept hidden from others or not meant to be known by others. noun
    She whispered a hemmelighed to her friend, ensuring no one else could hear.
    The diary contained many hemmeligheder that were never meant to be shared.
  2. The state or quality of being secret or hidden. noun
    The hemmelighed surrounding the project made everyone curious.
    He maintained a sense of hemmelighed about his past, revealing little to those around him.