Inert (adjective)

1. Not able to move or act.
2. Not showing emotion or reaction.
3. Not active or not capable of exerting force or energy.

Origin:

From latin iners, from in- ("not") + ers, ars ("activ.e")

Examples:

1. The gas was inert and not reactive.
2. He was inert and unresponsive to stimuli.
3. The substance was inert and did not react with other chemicals.
4. The patient was inert and didn't respond to the treatment.
5. The machine was inert and needed repair.