unfastened
1. [ adjective ] not closed or secured
Examples:

"the car door was unfastened" "unfastened seatbelts"

Related terms: fastened unbarred undone
2. [ adjective ] not buttoned
Synonyms: unbuttoned
Examples:

"the wind picked up the hem of her unbuttoned coat"

Related terms: buttoned open-collared open-collared
3. [ adjective ] affording unobstructed entrance and exit; not shut or closed
Synonyms: open
Examples:

"an open door" "they left the door open"

Related terms: shut wide-open wide-open ajar open
4. [ adjective ] not tied
Synonyms: untied
Related terms: tied
Similar spelling:   unfasten
  unfastener
  unfastening
  unbiased
  unfaceted
  unbiassed
  unpasteurized
  unpasteurised
  unfastidious
  unaffected