The Collaborative International Dictionary of English v.0.48:

Stealth \Stealth\ (st[e^]lth), n. [OE. stal[thorn]e. See
   Steal, v. t.]
   1. The act of stealing; theft. [Obs.]
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            The owner proveth the stealth to have been committed
            upon him by such an outlaw.           --Spenser.
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   2. The thing stolen; stolen property. [Obs.] "Sluttish dens .
      . . serving to cover stealths." --Sir W. Raleigh.
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   3. The bringing to pass anything in a secret or concealed
      manner; a secret procedure; a clandestine practice or
      action; -- in either a good or a bad sense.
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            Do good by stealth, and blush to find it fame.
                                                  --Pope.
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            The monarch, blinded with desire of wealth,
            With steel invades the brother's life by stealth.
                                                  --Dryden.
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            I told him of your stealth unto this wood. --Shak.
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WordNet (r) 3.0 (2006):

stealth
    n 1: avoiding detection by moving carefully [syn: stealth,
         stealing]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "stealth":
   Italian hand, acuteness, art, artfulness, artifice, astuteness,
   cageyness, callidity, canniness, clandestine behavior,
   clandestineness, clandestinity, cleverness, covertness, craft,
   craftiness, cunning, cunningness, fine Italian hand, finesse,
   foxiness, furtiveness, gamesmanship, guile, ingeniousness,
   insidiousness, inventiveness, one-upmanship, prowl, prowling,
   readiness, resourcefulness, satanic cunning, secrecy, sharpness,
   shiftiness, shrewdness, slinkiness, slipperiness, slyness,
   sneakiness, sophistry, stalking, stealthiness, subtilty,
   subtleness, subtlety, suppleness, surreptitiousness, trickiness,
   underground activity, underhand dealing, underhandedness, wariness,
   wiles, wiliness, wit