If someone has no permanent home or job and is not settled in any community, you can describe them as rootless .
例句
These rootless young people have nowhere else to go.这些漂泊不定的年轻人没有其他地方可去。...people who refused to integrate within society and instead lived rootless, jobless lives.那些不愿意融入社会而过着漂泊不定、没有工作的生活的人
英英词典释义
Adjective
1. wandering aimlessly without ties to a place or community;