Pronunciation: (slip'u-rē, slip'rē),[key] —adj.,-per•i•er, -per•i•est. 1. tending or liable to cause slipping or sliding, as ice, oil, a wet surface, etc.: a slippery road. 2. tending to slip from the hold or grasp or from position: a slippery rope. 3. likely to slip away or escape: slippery prospects. 4. not to be depended on; fickle; shifty, tricky, or deceitful.
5. unstable or insecure, as conditions: a slippery situation.