Loiterer (noun)

1. A person who idles or spends time aimlessly, especially in a public place.
2. A person who dawdles or takes a long time to do something.
3. A person who wastes time or lacks purpose.

Origin:

Late 16th century (in the sense 'idler, one who wastes time'): from obsolete loiter 'to waste time' + -er.

Examples:

1. The park was filled with loiterers who had nothing better to do than watch the world go by.
2. The security guard asked the loiterer to leave the premises.
3. The teacher scolded the loiterer for not doing his homework on time.
4. Many people view loiterers as lazy and unproductive.
5. Some cities have laws designed to discourage loitering, but they are often difficult to enforce.