Synonyms of unfasten in English:

unfasten


See US English definition of unfasten

See UK English definition of unfasten

See Spanish definition of desabrochar

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