C2 someone who is in a place or situation where they are not wanted不受欢迎者,不速之客
I feel like an intruder when I visit their home.我拜访他们家时总觉得自己像一名不速之客。
C2 someone who enters a place without permission in order to commit a crime闯入者,侵入者
Intruders had entered the house through a back window.盗贼从后窗闯入了住宅。