* Describing a person: The old man sat on the park bench, his face placid and serene.
* Describing a place: The lake was placid and still, reflecting the clear blue sky.
* Describing a situation: After the storm passed, the sea became placid again.
* Contrasting with a more active state: Despite the chaos around him, he remained placid and collected.
* Figurative language: Her anger was a storm, but his words were a placid sea, calming her down.