One-word substitution (character assessment): Choose the correct term for a person who cannot be corrected, reformed, or improved by punishment or persuasion. Context: The word should emphasize incorrigibility in habits or behavior patterns. Instruction: Select the best single-word substitute from the options.

Given data

• Sought meaning: cannot be corrected/reformed.
• Options: Incorrigible, Incurable, Hardened, Invulnerable.

Concept / Approach
Incorrigible directly denotes someone not reformable by correction or discipline. Other terms relate to disease (incurable), mere desensitization (hardened), or immunity to harm (invulnerable).

Elimination
Incorrigible — irreformable; correct. ✅Incurable — about illness; metaphorical use possible but not precise here. ❌Hardened — inured, but still potentially correctable. ❌Invulnerable — cannot be harmed; unrelated. ❌

Example
‘‘An incorrigible prankster who ignores repeated warnings.’’

Final Answer
Incorrigible