Unflappability
"Unflappability" in a Sentence (2 examples)
Tom is known for his wit and unflappability.
Longevity ran in the family; Mrs. Calment's mother lived until she was 86 and her father until he was 93. But Mr. Robine said her great strength was her unflappability. […]“She once said, ‘If you can't do anything about it, don't worry about it.’”