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unerring
UNESCO
unessential
unethical
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uneventful
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unexcelled
unexceptionable
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unfasten

un·fas·ten [ un fáss'n ] (past and past participle un·fas·tened, present participle un·fas·ten·ing, 3rd person present singular un·fas·tens)


transitive and intransitive verb 
Definition:
 
separate parts of something: to undo or open something by moving or loosening things that are holding it together, e.g. the buttons of a garment, or be undone or opened in this way

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