nonchalant

Meaning

1. Deliberately unbothered and cool, even when something matters.
2. A performed calm used to seem more attractive or in control.

“He didn’t text back for two days and called it staying nonchalant.”

Where it came from

The word itself is old, standard English, but TikTok turned it into a personality trend in the early 2020s, with creators posting guides on how to act unaffected by anything. The trend’s joking counterpart labeled anyone who cares openly as “chalant.”