Describing a situation that is prone to change or unpredictable.

परिवर्तनशील

English Usage: The market is currently unstable due to economic fluctuations.

Hindi Usage: आर्थिक उतार-चढ़ाव के कारण बाजार वर्तमान में परिवर्तनशील है।

Referring to something that is not firm or reliable.

अस्थिरता

English Usage: The unstable ground made it difficult to build the house.

Hindi Usage: अस्थिर जमीन पर घर बनाना मुश्किल था।

Though not commonly used as a verb, it can imply causing something to become unstable.

अस्थिर करना

English Usage: The sudden interference can unstable the system.

Hindi Usage: अचानक हस्तक्षेप प्रणाली को अस्थिर कर सकता है।