Inconstancy (noun)

1. A lack of consistency or steadiness in beliefs, opinions or behavior.
2. A tendency to change frequently, unpredictably or capriciously.

Origin:

Derived from the latin word "inconstantia" meaning "unsteadiness, fickleness".

Examples:

1. The inconstancy of his emotions made it difficult for his friends to understand him.
2. The inconstancy of the weather made it challenging for farmers to plan their harvest.
3. The inconstancy of the stock market caused anxiety for investors.
4. The inconstancy of her political views caused her followers to question her credibility.
5. The inconstancy of his job prospects was a source of stress for him and his family.