Mutable (adjective)

1. Capable of being changed or modified.
2. Liable to change or alteration.
3. Changeable or inconstant in nature or character.

Origin:

From the latin mutabilis, from mutare, meaning "to change".

Examples:

1. The weather is mutable and can change quickly.
2. His moods were mutable, and it was hard to predict how he would react.
3. The mutable nature of the stock market makes it difficult to predict.
4. The software is mutable and can be updated as needed.
5. The mutable laws of physics allowed scientists to make new discoveries.