loiterer

2. Someone who stays in a public place without an obvious purpose, often causing suspicion.

Security guards kept an eye on the loiterer near the entrance.

3. A person who wastes time by moving slowly and doing nothing useful.

He was a loiterer who never finished his chores on time.

4. Someone who delays leaving a place, lingering longer than expected.

The last loiterer finally left the café after closing time.