Incognito /(?)/

In·cog·ni·to

Incognito

a. [or] adv.
  1. 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.
    'T was long ago Since gods come down incognito.
    The prince royal of Persia came thither incognito.
    — Tatler.

Incognito

n.

pl. Incognitos

  1. One unknown or in disguise, or under an assumed character or name.
  2. The assumption of disguise or of a feigned character; the state of being in disguise or not recognized.
    His incognito was endangered.