mutable

adjective
UK /ˈmjuːtəbl/
US /ˈmjuːtəbl/

Able to change.

The weather in spring is mutable, so bring a jacket.


OTHER MEANINGS

2. Able to be changed in form or nature.

The mutable design of the app lets users rearrange the layout.

3. In computing, able to be modified after creation.

A mutable list can be edited in place, unlike a tuple.

4. Liable to change often; fickle.

His mutable opinions made it hard to predict his vote.