1. capable of change or being changed; not fixed or permanent
2. prone to change; inconstant or fickle

Examples

• The weather in spring is highly mutable, changing from sunny to stormy within hours.
• Human opinions are mutable and can shift based on new information.
• The company’s mutable policies made it difficult for employees to plan ahead.
• Unlike physical laws, social customs are mutable and evolve over time.
• The artist’s mutable style reflected her changing moods and influences.
• Software code should be designed with mutable and immutable components clearly defined.