What is the best definition for the word inure?

The term "inure" means to become accustomed to something, especially something unpleasant or challenging, often through repeated exposure. The most fitting definition among the given choices is "toughen," as it conveys the idea of making something or someone less sensitive or more resilient to difficulties.

In this context, being "toughened" implies that an individual has developed a degree of toughness or endurance against adversity, aligning closely with the essence of what it means to inure oneself to certain experiences or conditions.