nonchalance
🇺🇸
/ˌnɑːnʃəˈlɑːns/
🇬🇧
/ˈnɒnʃələns/
When someone is calm and does not seem worried or eager.
She answered the questions with nonchalance, looking completely relaxed.
她回答问题时表现得非常放松,看起来非常镇定。