The laws of physics are often considered immutable, yet scientific theories evolve as new evidence emerges.
物理定律常被视为不可改变的，但随着新证据的出现，科学理论也在不断演变。
Which choice best defines “immutable”?
A — Unchangeable.. “immutable” means Unchangeable..
Which word means “Unchangeable.”?
D — immutable. “immutable” means Unchangeable..
immutable — Unchangeable.. In Chinese: 不可改变的；永恒的.
immutable is pronounced //ɪˈmjuːtəbl//.
The laws of physics are often considered immutable, yet scientific theories evolve as new evidence emerges. (物理定律常被视为不可改变的，但随着新证据的出现，科学理论也在不断演变。)
unalterable, fixed, permanent — all close in meaning to immutable (Unchangeable.).
mutable, changeable — each the opposite of immutable (Unchangeable.).
Yes. immutable is on the SAT Prep Difficult list — the higher-register words that decide the hard questions. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
im(不) + mut(变) → 恒定不变。