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Adjective: incog  in'kóg or 'in,kóg
Usage: informal
  1. With your identity concealed
    "He went incog to the party, wearing a disguise";
    - incognito
Adverb: incog  in'kóg or 'in,kóg
Usage: informal
  1. Without revealing one's identity
    "in Holland he lived incog as a carpenter in the shipyards of the East India company";
    - incognito

See also: concealed