Synonyms of unfasten in English:

unfasten


See definition of unfasten

verb

1‘Ron unfastened his seat belt’

SYNONYMS
undo, open, detach, disconnect, remove, untie, unbutton, unzip, loose, loosen, free, separate, disengage, disjoin, uncouple, unwrap, unbind, unhook, unclick, unlace, unhitch, untether, unlock, unbolt
ANTONYMS

fasten, do something up, lock