unfastened

Adjective

• not tied

• not buttoned
  • the wind picked up the hem of her unbuttoned coat
    

• affording unobstructed entrance and exit; not shut or closed
  • an open door
    
  • they left the door open
    

• not closed or secured
  • the car door was unfastened
    
  • unfastened seatbelts
    

Related words

• Synonyms: 
  untied , unbuttoned , open
• Antonyms: 
  tied , fastened , buttoned , shut , unopen , closed