10
unfasten(verb, separate, release, loose, detach)
7
separate by cutting(fix, attachment)
6
loosen(verb, hold, increase, separate, release)
5
tear off(verb, fix, stick, connect, attach)
4
disconnect(verb, separate, release, loose, loosen)
4
release(noun, verb, hold, separate, keep)
4
undo(verb, open)
4
detach(verb, separate, release, join, loose)
4
disjoin(verb, separate, release, loose, loosen)
3
open(verb, adjective, hold, fix, separate)
3
sunder(verb, agree)
3
unbind(verb, hold)
3
unlink(verb, separate, release, loose, loosen)
3
untie(verb, separate, release, loose, loosen)
2
disengage(verb, join, connection)
2
dissociate
2
break(verb, destroy, agree, continue, face)
2
break up(verb, expression, phrasal verb)
2
demolish(verb, help, raise)
2
disjoint
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APASmart Define. (2016). fasten thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/fasten/thesaurus/antonyms
ChicagoSmart Define. 2016. "fasten thesaurus" https://smartdefine.org/fasten/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2016, fasten thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/fasten/thesaurus/antonyms>.
MLASmart Define. "fasten thesaurus" 3 March 2016. Web. 24 September 2026. <https://smartdefine.org/fasten/thesaurus/antonyms>