incognito

incognito
    adv 1: without revealing one's identity; "in Holland he lived
           incognito as a carpenter in the shipyards of the East
           India company"
    adj 1: with your identity concealed
    

Incognito \In*cog"ni*to\, a. or adv. [It. incognito, masc.,
   incognita, fem., L. incognitus unknown; pref. in- not +
   cognitus known, p. p. of cognoscere: cf. F. incognito, fr.
   {It}. See {Cognition}.]
   Without being known; in disguise; in an assumed character, or
   under an assumed title; -- said esp. of great personages who
   sometimes adopt a disguise or an assumed character in order
   to avoid notice.
   [1913 Webster]

         'T was long ago
         Since gods come down incognito.          --Prior.
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         The prince royal of Persia came thither incognito.
                                                  --Tatler.
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Incognito \In*cog"ni*to\, n.; pl. {Incognitos}. [See
   {Incognito}, a.]
   [1913 Webster]
   1. One unknown or in disguise, or under an assumed character
      or name.
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   2. The assumption of disguise or of a feigned character; the
      state of being in disguise or not recognized.
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            His incognito was endangered.         --Sir W.
                                                  Scott.
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75 Moby Thesaurus words for "incognito":
      anonym, anonymity, anonymous, anonymousness, camouflage,
      camouflaged, closed meeting, closet, concealed, confidentiality,
      confidentialness, cryptonymic, cryptonymous, disguise, disguised,
      domino, executive session, false colors, false face, false front,
      guisard, guiser, impersonator, in disguise, incog, incognita,
      inmost, innermost, innominate, interior, intimate, inward,
      isolated, isolation, mask, masked, masker, masque, masquerade,
      masquerader, masquerading, mummer, mummery, nameless, namelessness,
      on the sly, personal, privacy, private, private conference, privy,
      protective coloration, retired, retirement, secluded, seclusion,
      secretly, sequestered, sequestration, smoke screen, unacknowledged,
      undefined, under cover, undesignated, unidentified, unknown,
      unnamed, unrecognizable, unrecognized, unspecified, visor, vizard,
      vizard mask, withdrawn, without a name