adjective (a)

• not closed or secured(adj.all)

  Example:
  The car door was unfastened.
  Unfastened seatbelts.
  

  Antonym:
  fastened
  

  source: wordnet30
• affording unobstructed entrance and exit; not shut or closed(adj.all)

  Synonym:
  open
  Antonym:
  closed, shut, unopen
  

  source: wordnet30
• not buttoned(adj.all)

  Synonym:
  unbuttoned
  Antonym:
  buttoned, fastened
  

  source: wordnet30
• not tied(adj.all)

  Synonym:
  untied
  Antonym:
  fastened, tied
  

  source: wordnet30