1. frequently changing; not staying the same
2. not faithful or loyal, especially in relationships

Examples

• The weather has been inconstant all week, sunny one day and rainy the next.
• Her inconstant moods made it difficult for friends to know what to expect.
• The inconstant wind made sailing challenging for the crew.
• He proved to be an inconstant friend, abandoning her when she needed support.
• The inconstant nature of fashion trends keeps designers constantly creating new styles.
• Stock prices remained inconstant throughout the volatile trading session.