What is Stable ?
Stable is (adj) 1. steady and which does not shake The ladder is not very stable, will you hold it for me? Put a book under one leg of the desk to keep it sta- ble. Antonym unstable 2. which does not change The hospital said his condition was stable. Antonym unstable 3. (in chemistry) referring to a compound which does not change or decompose easily(noun) a build- ing for keeping a horse My horse is not in his stable, who’s riding him?
source: Easier English, Student Dictionary Upper Intermediate Level