1Despite the chaos around him, he remained nonchalant and continued to read his book.
2Her nonchalant attitude towards the deadline was starting to worry her colleagues.
3Was he really nonchalant about the news, or was he just hiding his true feelings?
4Try not to be nonchalant when your boss asks for your opinion on a critical project.
5There is a fine line between being nonchalant and being apathetic; make sure you know the difference.