Variable (adjective)

1. Likely to change or subject to change.
2. Able to take different values.

Origin:

Late 16th century: from late latin variabilis, from latin variare 'to vary'. the noun use dates from the mid 17th century.

Examples:

1. The weather in this region is highly variable.
2. Inflation is one of the most variable economic indicators.
3. The stock market is notorious for its variable returns.
4. The cost of living is highly variable depending on where you live.
5. The quality of the product can be variable.