Simple sentences:
* She was indifferent to his pleas for help.
* He remained indifferent to the news of his friend's success.
* The dog seemed indifferent to the presence of the cat.
More complex sentences:
* Despite the urgency of the situation, the government remained indifferent to the plight of the refugees.
* The judge's decision was a stark reminder that the law can be indifferent to the complexities of human life.
* While some people were deeply affected by the tragedy, others seemed strangely indifferent.
Sentences using "indifference":
* His indifference to the suffering of others was disturbing.
* Her indifference to fashion was a point of contention with her friends.
* The indifference of the public toward the politician's policies was evident in the low turnout at the rally.
Remember: "Indifferent" means lacking interest or concern. It can be used to describe a person, an attitude, or a response.