adjective (a)

• not established or confirmed(adj.all)

  Example:
  His doom is as yet unsealed.
  

  Synonym:
  uncertain
  Antonym:
  certain, sealed
  

  source: wordnet30
• not closed or secured with or as if with a seal(adj.all)

  Example:
  Unsealed goods.
  The letter arrived unsealed.
  

  Antonym:
  sealed
  

  source: wordnet30