Inoperative (adjective)

1. Not functioning or being in effect; not operative.
2. Not working or in use.

Origin:

This word is formed by the combination of the prefix "in-" meaning "not" and the word "operative" meaning "functioning or being in effect".

Examples:

1. The machine was inoperative due to a lack of maintenance.
2. The computer was inoperative after a power outage.
3. The inoperative elevator stranded the employees in the building.
4. The inoperative security system left the building vulnerable to break-ins.
5. The inoperative light caused a safety hazard in the area.