How can job applicants effectively convey their ability to think on their feet and adapt to unexpected challenges in their cover letter or resume?

Job applicants can effectively convey their ability to think on their feet and adapt to unexpected challenges by highlighting specific examples in their cover letter or resume where they successfully handled unexpected situations. They can also showcase their problem-solving skills and ability to remain calm under pressure. Including relevant keywords such as "quick decision-making" and "flexibility" can help emphasize these qualities to potential employers. Additionally, applicants can mention any relevant training or certifications they have that demonstrate their ability to adapt to changing circumstances.