condescendingly
🇺🇸
/ˌkɑːndɪˈsendɪŋli/
🇬🇧
/ˌkɒndɪˈsendɪŋli/
Behaving in a way that shows you think you are better or smarter than others.
She condescendingly explained the task to the new employee, as if they were incapable of understanding.