haikaisha
はいかいしゃ
someone who roams or moves around freely ; someone who loiters
Note
Gradually going out of use because the word can lead to misunderstanding
Example
きのうの かんごきろくに よると、はいかいしゃの かずは 0だそうです。
The number of those who wandered around freely was 0 according to yesterday's nurse's
records.