4
unfastened(verb, adjective)
4
untied(verb, adjective)
3
unbuttoned(verb, adjective)
3
unbolted
3
unlocked
2
loosened
2
open(adjective, limited, restricted, unglued, hindered)
2
unbarred
2
undone(adjective, fastened)
1
unlatched
1
unsecured
0
detached
0
dehiscent
0
detach
0
disconnected
0
disengaged
0
disentangled
0
disrepair
0
extricated
0
free
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APASmart Define. (2016). fastened thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fastened/thesaurus/antonyms
ChicagoSmart Define. 2016. "fastened thesaurus" https://smartdefine.org/fastened/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, fastened thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fastened/thesaurus/antonyms>.
MLASmart Define. "fastened thesaurus" 11 February 2016. Web. 23 September 2026. <https://smartdefine.org/fastened/thesaurus/antonyms>