Adjective: (of a person) Having one’s true identity concealed: “operating incognito”
Noun: An assumed or false identity
This young man was walking down the back alley behind my work building. Being three floors up I captured this photo of him walking alone, concealed, unidentifiable. Being so focused on his walk, he was completely oblivious to the goings on around him, and oblivious to my secretive photography.