inert

Etymology

From French inerte, from Latin iners (“inactive, inert”).

adj

1. Unable to move or act; inanimate.
   As for the other forms of magic, previous systems of magic are now accessible if one knows how to do so, though no human alive should know how. This does mean some magical objects and wands rendered inert by previous changes will work again. 21 February 2018, Dan Shive, El Goonish Shive (webcomic), Comic for Wednesday, Feb 21, 2018
2. Sluggish or lethargic.
3. In chemistry, not readily reacting with other elements or compounds.
4. Having no therapeutic action.

noun

1. (chemistry) A substance that does not react chemically.

verb

1. To fill with an inert gas to reduce the risk of explosion.