incognito

incognito is an   Adverb

Definition:

[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. Prior. The prince royal of Persia came thither incognito. Tatler.

Synonyms: