With a literal meaning:
* The city's streets were impervious to the downpour, thanks to the newly installed drainage system.
* The raincoat was impervious to the heavy rain, keeping her dry.
* The plastic wrap is impervious to water, so it's perfect for storing food.
With a figurative meaning:
* Despite the criticism, she remained impervious to the negativity, focusing on her goals.
* The athlete was impervious to the pain, pushing himself to the finish line.
* He was impervious to her charms, his heart seemingly unmoved.
Remember that "impervious" implies a lack of ability to be affected by something. You can use it to describe things that are resistant to water, emotions, or any other external influence.