workerless
/ˈwəːkələs/adjective
1 Entomology. Designating insects which, unlike related species, have no worker caste, especially certain ants and bees that parasitize the colonies of social species.
2Having no workers. Now especially: (of a business, factory, etc.) wholly automated, so as to make human workers unnecessary.
Origin
Late 19th century; earliest use found in Churchman. From worker + -less.