Usually means: Release or undo something secured.
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We found 4 dictionaries that define the word unfast:

General (4 matching dictionaries)
  1. unfast: Wordnik
  2. unfast: Wiktionary
  3. unfast: Webster's 1828 Dictionary
  4. unfast: FreeDictionary.org

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Definitions from Wiktionary (unfast)

▸ verb:  (transitive) To loose; release.
▸ adjective:  Not fast or safe; not secure.

Similar:
loose, unfasten, loose off, loosen, unlash, unlock, unloose, let loose, unfix, unloosen, more...

Opposite:
fastened, secured, tightened, attached, fixed

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Similar:
loose, unfasten, loose off, loosen, unlash, unlock, unloose, let loose, unfix, unloosen, more...

Opposite:
fastened, secured, tightened, attached, fixed



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