Here are some examples of how "ardeur" might be used:
* "Il a abordé la tâche avec ardeur." (He tackled the task with enthusiasm.)
* "Elle ressentait une ardeur à réussir." (She felt a passion for success.)
* "Son ardeur à défendre ses convictions était remarquable." (His zeal in defending his beliefs was remarkable.)
So, "ardeur" describes a strong feeling of excitement, drive, and commitment towards something.