unruffed
/ˈənrʌft, ənˈrʌft/Definitions
1. adjective
not excited or agitated, especially in a difficult situation
“The unruffed sailor calmly navigated the stormy waters.”
2. noun
a person who remains unruffled, especially in a difficult situation
“She’s a true unruffed leader, inspiring her team to stay calm under pressure.”