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Verb: unfasten  `ún'fã-sun
  1. Cause to become undone
    "unfasten your belt"
     
  2. Become undone or untied
    "The shoelaces unfastened"

Derived forms: unfastened, unfastens, unfastening

See also: unfastener, unfastening

Type of: open, open up, undo

Antonym: fasten

Nearest

unfaithful
unfaithfully
unfaithfulness
unfaltering
unfalteringly
unfamiliar
unfamiliar with
unfamiliarity
unfashionable
unfashionably
unfasten
unfastened
unfastener
unfastening
unfastidious
unfathomable
unfathomably
unfathomed
unfattened
unfavorable
unfavorable judgment