aplomb
/ˈæplɒm/Definitions
1. noun
complete confidence and composure, especially in a difficult or trying situation; calm and self-assured manner
“She maintained her aplomb in the midst of chaos, earning the respect of her colleagues.”
2. verb
to maintain one’s composure or confidence, especially in a difficult or trying situation
“She was able to aplomb herself in the face of criticism, refusing to let it affect her work.”