incognito

1. ADJ Someone who is incognito is using a false name or wearing a disguise, in order not to be recognized or identified. 隱姓埋名的; 使用化名的; 隱瞞真實身份的[v-link ADJ, ADJ after v]

Hotel inspectors have to travel incognito. 酒店檢查員巡查時必須隱瞞真實身份。