Understaffed (adjective)

1. Having too few staff for the work that needs to be done.
2. Short-handed, not having enough employees to perform a job or task efficiently.

Origin:

Early 20th century: from under- + staffed.

Examples:

1. The hospital was understaffed and overworked.
2. The company was understaffed during the busy season.
3. The store was understaffed, and customers had to wait in long lines.
4. The school was understaffed, and teachers were overwhelmed with work.
5. The factory was understaffed, and production was slow.