1. Incurable
  2. Incorrigible
  3. Hardened
  4. Invulnerable
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1 Answers

Answer: Option 2

One word substitution is Incorrigible. Incurable: not able to be cured. Incorrigible: not able to be changed or reformed. Hardened: having become or been made hard or harder. Invulnerable: impossible to harm or damage.

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