SANGFROID (OR APLOMB OR EQUANIMITY) (Noun)

Meaning- the ability to stay calm and polite in a dangerous or stressful situation.  

Synonym- COMPOSURE, PLACIDITY, TRANQUILLITY

Uses-

•          I was amazed at how he retained his sangfroid throughout the discussion.
•          They committed the robbery with complete sangfroid.
•          Despite the workload, I managed to maintain my sangfroid and to provide composure, solid leadership, and support to my staff.
•          Nothing could disturb his sangfroid.