adjective

• (not comparable) Unable to reproduce (or procreate).
• (figurative) Terse; lacking sentiment or emotional stimulation, as in a manner of speaking.
• (figurative) Fruitless, uninspiring, or unproductive.
• Germless; free from all living or viable microorganisms.
• Free from dangerous objects, as a zone in an airport that can be only be entered via a security checkpoint.
• (US, military) Of weapons: foreign-made and untraceable to the United States.