intruder
noun [ C ] uk/ɪnˈtruː.dər/ us/ɪnˈtruː.dɚ/
C2 不受欢迎者，不速之客
someone who is in a place or situation where they are not wanted
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 闯入者，侵入者
someone who enters a place without permission in order to commit a crime
Intruders had entered the house through a back window. 盗贼从后窗闯入了住宅。