Choose the adjective meaning unchanging over time or unable to be altered:

Philosophers of legal positivism reject the notion that moral codes are ________ natural laws etched permanently into human consciousness.

Answer and explanation

Correct answer: D. immutable

Answer: immutable. Why not the others: 'irrevocable' means unable to be repealed or annulled (said of a decision or decree); 'inscrutable' means impossible to understand or interpret; 'impervious' means not allowing fluid to pass through, or unable to be affected by.
  1. Step 1: Identify the meaning: the moral codes are described as permanent and incapable of changing or being changed.
  2. Step 2: 'In-' (not, assimilated to 'im-' before bilabial 'm') + 'mutare' (to change) forms 'immutable' (unchanging over time or unable to be changed).

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