adjective (a)

• firmly closed or secured(adj.all)

  Example:
  Found the gate fastened.
  A fastened seatbelt.
  

  Antonym:
  unfastened
  

  source: wordnet30
• furnished or closed with buttons or something buttonlike(adj.all)

  Synonym:
  buttoned
  Antonym:
  unbuttoned, unfastened
  

  source: wordnet30
• fastened with strings or cords(adj.all)

  Synonym:
  tied
  Antonym:
  unfastened, untied
  

  source: wordnet30