Nonchalant/ˌnɑːnʃəˈlɑːnt/ Definition 1 of 1Pro Tip 1/3Subtle Indifference Use 'nonchalant' to subtly imply someone doesn't care much, without being rude. Despite the commotion, she remained nonchalant. Pro Tip 2/3Hidden Excitement 'Nonchalant' can describe hiding excitement or nerves with a calm exterior. He was nonchalant about the movie premiere, but inside, he was thrilled. Pro Tip 3/3Cool Demeanor 'Nonchalant' often indicates a controlled or purposely laid-back demeanor. Her nonchalant pose at the interview masked her anticipation.