The Collaborative International Dictionary of English v.0.48:

failed \failed\ adj.
   unsuccessful. Opposite of successful.

   Syn: failing.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Fail \Fail\ (f[=a]l) v. i. [imp. & p. p. Failed (f[=a]ld); p.
   pr. & vb. n. Failing.] [F. failir, fr. L. fallere, falsum,
   to deceive, akin to E. fall. See Fail, and cf. Fallacy,
   False, Fault.]
   1. To be wanting; to fall short; to be or become deficient in
      any measure or degree up to total absence; to cease to be
      furnished in the usual or expected manner, or to be
      altogether cut off from supply; to be lacking; as, streams
      fail; crops fail.
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            As the waters fail from the sea.      --Job xiv. 11.
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            Till Lionel's issue fails, his should not reign.
                                                  --Shak.
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   2. To be affected with want; to come short; to lack; to be
      deficient or unprovided; -- used with of.
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            If ever they fail of beauty, this failure is not be
            attributed to their size.             --Berke.
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   3. To fall away; to become diminished; to decline; to decay;
      to sink.
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            When earnestly they seek
            Such proof, conclude they then begin to fail.
                                                  --Milton.
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   4. To deteriorate in respect to vigor, activity, resources,
      etc.; to become weaker; as, a sick man fails.
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   5. To perish; to die; -- used of a person. [Obs.]
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            Had the king in his last sickness failed. --Shak.
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   6. To be found wanting with respect to an action or a duty to
      be performed, a result to be secured, etc.; to miss; not
      to fulfill expectation.
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            Take heed now that ye fail not to do this. --Ezra
                                                  iv. 22.
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            Either my eyesight fails, or thou look'st pale.
                                                  --Shak.
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   7. To come short of a result or object aimed at or desired;
      to be baffled or frusrated.
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            Our envious foe hath failed.          --Milton.
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   8. To err in judgment; to be mistaken.
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            Which ofttimes may succeed, so as perhaps
            Shall grieve him, if I fail not.      --Milton.
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   9. To become unable to meet one's engagements; especially, to
      be unable to pay one's debts or discharge one's business
      obligation; to become bankrupt or insolvent; as, many
      credit unions failed in the late 1980's.
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Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "failed":
   abortive, bankrupt, bootless, broke, broken, busted, destitute,
   failing, fruitless, futile, in receivership, ineffective,
   ineffectual, inefficacious, insolvent, lame, manque, miscarried,
   miscarrying, of no effect, on the rocks, ruined, stickit,
   stillborn, successless, unfortunate, unsuccessful, useless