INCOGNITO

–adjective

1.

having one's identity concealed, as under an assumed name, especially to avoid notice or formal attentions.

–adverb

2.

with the real identity concealed: to travel incognito.

–noun

3.

a person who is incognito.

4.

the state of being incognito.

5.

the disguise or character assumed by an incognito.

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—Synonyms 1.  disguised, undisclosed, unidentified.