Incognito is the term used when someone conceals their identity. They can also be referred to as anonymous by others.
disguise
Hide
disguise
To conceal his identity
"He was allowed to conceal his firearm, since he had a license." "As a hunted fugitive, he had to conceal his identity."
The opposite of the word "divulge" is "conceal." While "divulge" means to reveal or make known information, "conceal" refers to the act of hiding or keeping information secret. Other synonyms for conceal include "suppress" and "withhold."
Another word for conceal is to hide, disguise and hold back.
"He was allowed to conceal his firearm, since he had a license." "As a hunted fugitive, he had to conceal his identity."
Hide.Definition: To conceal or hide an item.
To conceal his real identity as Ansem the wise.
The prefix 'dis-' in the word disguise means "not" or "opposite of", so disguise means to not show one's true identity or to conceal one's appearance or intentions.
The word you're looking for is "disguise." It refers to altering one's appearance deliberately in order to conceal one's identity or intentions.