What is the meaning of the word "immutable"?

The word "immutable" refers to something that is unchangeable or unable to be altered. It conveys the idea of permanence and stability, suggesting that a particular state or condition cannot be modified or changed over time. In various contexts, this term might be used to describe laws, truths, or characteristics that remain constant regardless of external factors. The emphasis on "unchangeable" captures the essence of immutability, making it the correct choice.

Understanding the context of the other options helps clarify why "immutable" is best defined as "unchangeable." For example, "breakable" implies fragility and the ability to change form or state, which contradicts the meaning of immutable. Similarly, "desirable" and "flexible" suggest qualities of changeability or preferences, diverging from the fixed nature associated with the term in question.