- (of a person) having one's true identity concealed（人）隐姓埋名的（地）, 隐瞒身份的（地）, 化名的（地）：
as adj. in order to observe you have to be incognito你必须隐姓埋名以便观察。
as adv. he is now operating incognito.他在隐名活动。
词源
mid 17th cent.: from Italian， literally 'unknown'， from Latin incognitus, from in- 'not' + cognitus （past participle of cognoscere 'know'）.