sterile

adjective7

1. •
   Unable to reproduce (or procreate).
2. •
   Germless; free from all living or viable microorganisms.
3. •
   Free from dangerous objects, as a zone in an airport that can be only be entered via a security checkpoint.
4. •
   (figurative) Fruitless, uninspiring, or unproductive.
5. •
   (figurative) Terse; lacking sentiment or emotional stimulation, as in a manner of speaking.
6. •
   Permanently uninhabitable (as in a planet like Earth) to all life, including even microbes.
7. •
   (US) Of weapons: foreign-made and untraceable to the United States.