un·faith·ful /ˌʌnˈfeθfəl/
 (a.)不誠實的,不忠實的


 Un·faith·ful a.
 1. Not faithful; not observant of promises, vows, allegiance, or duty; violating trust or confidence; treacherous; perfidious; as, an unfaithful subject; an unfaithful agent or servant.
    My feet, through wine, unfaithful to their weight.   --Pope.
 His honor rooted in dishonor stood,
 And faith unfaithful kept him falsely true.   --Tennyson.
 2. Not possessing faith; infidel. [R.]
 -- Un*faith*ful*ly, adv. -- Un*faith*ful*ness, n.

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 unfaithful
      adj 1: not true to duty or obligation or promises; "an unfaithful
             lover" [ant: faithful]
      2: having sexual relations with someone other than your husband
         or wife, or your boyfriend or girlfriend; "her husband was
         unfaithful" [ant: faithful]
      3: deliberately and abominably disloyal or likely to betray
         trust or confidence; "the faithless Benedict Arnold"; "a
         lying traitorous insurrectionist" [syn: faithless, traitorous]
      4: not trustworthy; "an unfaithful reproduction"